diff --git a/.eslintrc b/.eslintrc
new file mode 100644
index 0000000..381678f
--- /dev/null
+++ b/.eslintrc
@@ -0,0 +1,7 @@
+{
+  "extends": "eslint:recommended",
+  "env": {
+    "node": true,
+    "mocha": true
+  }
+}
diff --git a/package-lock.json b/package-lock.json
index deac846..06260bb 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,6 +4,45 @@
   "lockfileVersion": 1,
   "requires": true,
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+      "version": "5.7.1",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.7.1.tgz",
+      "integrity": "sha512-d+nbxBUGKg7Arpsvbnlq61mc12ek3EY8EQldM3GPAhWJ1UVxC6TDGbIvUMNU6obBX3i1+ptCIzV4vq0gFPEGVQ==",
+      "dev": true
+    },
+    "acorn-jsx": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-4.1.1.tgz",
+      "integrity": "sha512-JY+iV6r+cO21KtntVvFkD+iqjtdpRUpGqKWgfkCdZq1R+kbreEl8EcdcJR4SmiIgsIQT33s6QzheQ9a275Q8xw==",
+      "dev": true,
+      "requires": {
+        "acorn": "^5.0.3"
+      }
+    },
+    "ajv": {
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+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.5.1.tgz",
+      "integrity": "sha512-pgZos1vgOHDiC7gKNbZW8eKvCnNXARv2oqrGQT7Hzbq5Azp7aZG6DJzADnkuSq7RH6qkXp4J/m68yPX/2uBHyQ==",
+      "dev": true,
+      "requires": {
+        "fast-deep-equal": "^2.0.1",
+        "fast-json-stable-stringify": "^2.0.0",
+        "json-schema-traverse": "^0.4.1",
+        "uri-js": "^4.2.1"
+      }
+    },
+    "ajv-keywords": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-3.2.0.tgz",
+      "integrity": "sha1-6GuBnGAs+IIa1jdBNpjx3sAhhHo=",
+      "dev": true
+    },
+    "ansi-escapes": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.1.0.tgz",
+      "integrity": "sha512-UgAb8H9D41AQnu/PbWlCofQVcnV4Gs2bBJi9eZPxfU/hgglFh3SMDMENRIqdr7H6XFnXdoknctFByVsCOotTVw==",
+      "dev": true
+    },
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       "resolved": "https://registry.npmjs.org/ansi-gray/-/ansi-gray-0.1.1.tgz",
@@ -31,18 +70,53 @@
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       "dev": true
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+      "version": "1.0.10",
+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
+      "integrity": "sha512-o5Roy6tNG4SL/FOkCAN6RzjiakZS25RLYFrcMttJqbdd8BWrnA+fGz57iN5Pb06pvBGvl5gQ0B48dJlslXvoTg==",
+      "dev": true,
+      "requires": {
+        "sprintf-js": "~1.0.2"
+      }
+    },
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       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/array-differ/-/array-differ-1.0.0.tgz",
       "integrity": "sha1-7/UuN1gknTO+QCuLuOVkuytdQDE=",
       "dev": true
     },
+    "array-union": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/array-union/-/array-union-1.0.2.tgz",
+      "integrity": "sha1-mjRBDk9OPaI96jdb5b5w8kd47Dk=",
+      "dev": true,
+      "requires": {
+        "array-uniq": "^1.0.1"
+      }
+    },
     "array-uniq": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/array-uniq/-/array-uniq-1.0.3.tgz",
       "integrity": "sha1-r2rId6Jcx/dOBYiUdThY39sk/bY=",
       "dev": true
     },
+    "arrify": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/arrify/-/arrify-1.0.1.tgz",
+      "integrity": "sha1-iYUI2iIm84DfkEcoRWhJwVAaSw0=",
+      "dev": true
+    },
+    "babel-code-frame": {
+      "version": "6.26.0",
+      "resolved": "https://registry.npmjs.org/babel-code-frame/-/babel-code-frame-6.26.0.tgz",
+      "integrity": "sha1-Y/1D99weO7fONZR9uP42mj9Yx0s=",
+      "dev": true,
+      "requires": {
+        "chalk": "^1.1.3",
+        "esutils": "^2.0.2",
+        "js-tokens": "^3.0.2"
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       "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
@@ -71,6 +145,21 @@
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       "dev": true
     },
+    "caller-path": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/caller-path/-/caller-path-0.1.0.tgz",
+      "integrity": "sha1-lAhe9jWB7NPaqSREqP6U6CV3dR8=",
+      "dev": true,
+      "requires": {
+        "callsites": "^0.2.0"
+      }
+    },
+    "callsites": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/callsites/-/callsites-0.2.0.tgz",
+      "integrity": "sha1-r6uWJikQp/M8GaV3WCXGnzTjUMo=",
+      "dev": true
+    },
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       "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
@@ -84,6 +173,33 @@
         "supports-color": "^2.0.0"
       }
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+    "chardet": {
+      "version": "0.4.2",
+      "resolved": "https://registry.npmjs.org/chardet/-/chardet-0.4.2.tgz",
+      "integrity": "sha1-tUc7M9yXxCTl2Y3IfVXU2KKci/I=",
+      "dev": true
+    },
+    "circular-json": {
+      "version": "0.3.3",
+      "resolved": "https://registry.npmjs.org/circular-json/-/circular-json-0.3.3.tgz",
+      "integrity": "sha512-UZK3NBx2Mca+b5LsG7bY183pHWt5Y1xts4P3Pz7ENTwGVnJOUWbRb3ocjvX7hx9tq/yTAdclXm9sZ38gNuem4A==",
+      "dev": true
+    },
+    "cli-cursor": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-2.1.0.tgz",
+      "integrity": "sha1-s12sN2R5+sw+lHR9QdDQ9SOP/LU=",
+      "dev": true,
+      "requires": {
+        "restore-cursor": "^2.0.0"
+      }
+    },
+    "cli-width": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/cli-width/-/cli-width-2.2.0.tgz",
+      "integrity": "sha1-/xnt6Kml5XkyQUewwR8PvLq+1jk=",
+      "dev": true
+    },
     "clone": {
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       "resolved": "https://registry.npmjs.org/clone/-/clone-1.0.4.tgz",
@@ -96,6 +212,21 @@
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       "dev": true
     },
+    "color-convert": {
+      "version": "1.9.2",
+      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.2.tgz",
+      "integrity": "sha512-3NUJZdhMhcdPn8vJ9v2UQJoH0qqoGUkYTgFEPZaPjEtwmmKUfNV46zZmgB2M5M4DCEQHMaCfWHCxiBflLm04Tg==",
+      "dev": true,
+      "requires": {
+        "color-name": "1.1.1"
+      }
+    },
+    "color-name": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.1.tgz",
+      "integrity": "sha1-SxQVMEz1ACjqgWQ2Q72C6gWANok=",
+      "dev": true
+    },
     "color-support": {
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       "resolved": "https://registry.npmjs.org/color-support/-/color-support-1.1.3.tgz",
@@ -120,6 +251,19 @@
       "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=",
       "dev": true
     },
+    "cross-spawn": {
+      "version": "6.0.5",
+      "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-6.0.5.tgz",
+      "integrity": "sha512-eTVLrBSt7fjbDygz805pMnstIs2VTBNkRm0qxZd+M7A5XDdxVRWO5MxGBXZhjY4cqLYLdtrGqRf8mBPmzwSpWQ==",
+      "dev": true,
+      "requires": {
+        "nice-try": "^1.0.4",
+        "path-key": "^2.0.1",
+        "semver": "^5.5.0",
+        "shebang-command": "^1.2.0",
+        "which": "^1.2.9"
+      }
+    },
     "dateformat": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/dateformat/-/dateformat-2.2.0.tgz",
@@ -135,12 +279,60 @@
         "ms": "2.0.0"
       }
     },
+    "deep-is": {
+      "version": "0.1.3",
+      "resolved": "https://registry.npmjs.org/deep-is/-/deep-is-0.1.3.tgz",
+      "integrity": "sha1-s2nW+128E+7PUk+RsHD+7cNXzzQ=",
+      "dev": true
+    },
+    "define-properties": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/define-properties/-/define-properties-1.1.2.tgz",
+      "integrity": "sha1-g6c/L+pWmJj7c3GTyPhzyvbUXJQ=",
+      "dev": true,
+      "requires": {
+        "foreach": "^2.0.5",
+        "object-keys": "^1.0.8"
+      }
+    },
+    "del": {
+      "version": "2.2.2",
+      "resolved": "https://registry.npmjs.org/del/-/del-2.2.2.tgz",
+      "integrity": "sha1-wSyYHQZ4RshLyvhiz/kw2Qf/0ag=",
+      "dev": true,
+      "requires": {
+        "globby": "^5.0.0",
+        "is-path-cwd": "^1.0.0",
+        "is-path-in-cwd": "^1.0.0",
+        "object-assign": "^4.0.1",
+        "pify": "^2.0.0",
+        "pinkie-promise": "^2.0.0",
+        "rimraf": "^2.2.8"
+      },
+      "dependencies": {
+        "object-assign": {
+          "version": "4.1.1",
+          "resolved": "https://registry.npmjs.org/object-assign/-/object-assign-4.1.1.tgz",
+          "integrity": "sha1-IQmtx5ZYh8/AXLvUQsrIv7s2CGM=",
+          "dev": true
+        }
+      }
+    },
     "diff": {
       "version": "3.5.0",
       "resolved": "https://registry.npmjs.org/diff/-/diff-3.5.0.tgz",
       "integrity": "sha512-A46qtFgd+g7pDZinpnwiRJtxbC1hpgf0uzP3iG89scHk0AUC7A1TGxf5OiiOUv/JMZR8GOt8hL900hV0bOy5xA==",
       "dev": true
     },
+    "doctrine": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/doctrine/-/doctrine-2.1.0.tgz",
+      "integrity": "sha512-35mSku4ZXK0vfCuHEDAwt55dg2jNajHZ1odvF+8SSr82EsZY4QmXfuWso8oEd8zRhVObSN18aM0CjSdoBX7zIw==",
+      "dev": true,
+      "requires": {
+        "esutils": "^2.0.2"
+      }
+    },
     "duplexer2": {
       "version": "0.0.2",
       "resolved": "https://registry.npmjs.org/duplexer2/-/duplexer2-0.0.2.tgz",
@@ -150,12 +342,207 @@
         "readable-stream": "~1.1.9"
       }
     },
+    "es-abstract": {
+      "version": "1.12.0",
+      "resolved": "https://registry.npmjs.org/es-abstract/-/es-abstract-1.12.0.tgz",
+      "integrity": "sha512-C8Fx/0jFmV5IPoMOFPA9P9G5NtqW+4cOPit3MIuvR2t7Ag2K15EJTpxnHAYTzL+aYQJIESYeXZmDBfOBE1HcpA==",
+      "dev": true,
+      "requires": {
+        "es-to-primitive": "^1.1.1",
+        "function-bind": "^1.1.1",
+        "has": "^1.0.1",
+        "is-callable": "^1.1.3",
+        "is-regex": "^1.0.4"
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+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/es-to-primitive/-/es-to-primitive-1.1.1.tgz",
+      "integrity": "sha1-RTVSSKiJeQNLZ5Lhm7gfK3l13Q0=",
+      "dev": true,
+      "requires": {
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@@ -635,12 +1625,87 @@
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@@ -689,6 +1754,33 @@
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@@ -706,12 +1798,36 @@
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diff --git a/package.json b/package.json
index 71775c3..e4aaf06 100644
--- a/package.json
+++ b/package.json
@@ -15,6 +15,7 @@
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