use 'coffeescript' package

lib/moduleEnv.js

@@ -89,6 +89,10 @@ function jsExtension(module, filename) {
 }
 
 function coffeeExtension(module, filename) {
+    if (!coffee) {
+        throw new Error("please add 'coffeescript' to your devDependencies");
+    }
+
     var content = stripBOM(fs.readFileSync(filename, "utf8"));
 
     restoreExtensions();
@@ -113,9 +117,14 @@ function stripBOM(content) {
 }
 
 try {
-    coffee = require("coffee-script");
+    coffee = require("coffeescript");
 } catch (err) {
-    // We are not able to provide coffee-script support, but that's ok as long as the user doesn't want it.
+    try {
+        // Trying to load deprecated package
+        coffee = require("coffee-script");
+    } catch (err) {
+        // We are not able to provide coffee-script support, but that's ok as long as the user doesn't want it.
+    }
 }
 
 exports.load = load;

package.json

@@ -30,7 +30,7 @@
     "url": "git://github.com/jhnns/rewire.git"
   },
   "devDependencies": {
-    "coffee-script": "^1.8.0",
+    "coffeescript": "^2.1.1",
     "expect.js": "^0.3.1",
     "mocha": "^4.0.1"
   },