Bump json from 1.8.1 to 2.5.1

Gemfile.lock

@@ -61,14 +61,16 @@ GEM
     cocaine (0.5.3)
       climate_control (>= 0.0.3, < 1.0)
     columnize (0.3.6)
+    concurrent-ruby (1.1.8)
     dragonfly (1.0.3)
       multi_json (~> 1.0)
       rack
     erubis (2.7.0)
     hike (1.2.3)
-    i18n (0.6.9)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
     journey (1.0.4)
-    json (1.8.1)
+    json (2.5.1)
     kgio (2.9.2)
     linecache (0.46)
       rbx-require-relative (> 0.0.4)
@@ -91,7 +93,7 @@ GEM
     mongoid-paperclip (0.0.9)
       paperclip (>= 2.3.6)
     moped (1.5.2)
-    multi_json (1.9.2)
+    multi_json (1.15.0)
     mynyml-redgreen (0.7.1)
       term-ansicolor (>= 1.0.4)
     nokogiri (1.6.1)
@@ -104,12 +106,12 @@ GEM
       cocaine (~> 0.5.3)
       mime-types
     polyglot (0.3.4)
-    rack (1.4.5)
-    rack-cache (1.2)
+    rack (1.4.7)
+    rack-cache (1.12.1)
       rack (>= 0.4)
-    rack-ssl (1.3.3)
+    rack-ssl (1.3.4)
       rack
-    rack-test (0.6.2)
+    rack-test (0.6.3)
       rack (>= 1.0)
     rails (3.2.3)
       actionmailer (= 3.2.3)
@@ -127,16 +129,15 @@ GEM
       rdoc (~> 3.4)
       thor (~> 0.14.6)
     raindrops (0.13.0)
-    rake (10.1.1)
+    rake (13.0.3)
     rbx-require-relative (0.0.9)
-    rdoc (3.12.2)
-      json (~> 1.4)
+    rdoc (3.9.5)
     ruby-debug (0.10.4)
       columnize (>= 0.1)
       ruby-debug-base (~> 0.10.4.0)
     ruby-debug-base (0.10.4)
       linecache (>= 0.3)
-    sprockets (2.1.3)
+    sprockets (2.1.4)
       hike (~> 1.2)
       rack (~> 1.0)
       tilt (~> 1.1, != 1.3.0)