Bump rake and some other gem dependencies.

Trying to debug some odd CI build errors related to not finding this
version of rake.

Gemfile

@@ -2,7 +2,7 @@ source "https://rubygems.org"
 source "https://rails-assets.org"
 
 gem "middleman", "~> 3.3.5"
-gem "rake", "~> 10.3.2"
+gem "rake", "~> 10.4.2"
 
 # Environment specific config with environment variables
 gem "dotenv", "~> 0.11.1"

Gemfile.lock

@@ -47,17 +47,18 @@ GEM
       http_parser.rb (~> 0.6.0)
     erubis (2.7.0)
     eventmachine (1.0.7)
-    execjs (2.2.1)
-    ffi (1.9.3)
+    execjs (2.6.0)
+    ffi (1.9.10)
     haml (4.0.5)
       tilt
     hike (1.2.3)
     hooks (0.4.0)
       uber (~> 0.0.4)
     http_parser.rb (0.6.0)
     i18n (0.6.11)
-    json (1.8.1)
+    json (1.8.3)
     kramdown (1.4.1)
+    libv8 (3.16.14.13)
     listen (2.7.9)
       celluloid (>= 0.15.2)
       rb-fsevent (>= 0.9.3)
@@ -124,10 +125,11 @@ GEM
     rails-assets-fontawesome (4.1.0)
     rails-assets-jquery (1.11.2)
     rails-assets-parsleyjs (2.0.3)
-    rake (10.3.2)
+    rake (10.4.2)
     rb-fsevent (0.9.4)
     rb-inotify (0.9.5)
       ffi (>= 0.5.0)
+    ref (2.0.0)
     rouge (1.6.2)
     sass (3.3.14)
     sprockets (2.12.1)
@@ -144,14 +146,17 @@ GEM
       colorize (>= 0.7.0)
       net-scp (>= 1.1.2)
       net-ssh (>= 2.8.0)
+    therubyracer (0.12.2)
+      libv8 (~> 3.16.14.0)
+      ref
     thor (0.19.1)
     thread_safe (0.3.4)
     tilt (1.4.1)
     timers (1.1.0)
     tzinfo (1.2.2)
       thread_safe (~> 0.1)
     uber (0.0.8)
-    uglifier (2.5.3)
+    uglifier (2.7.2)
       execjs (>= 0.3.0)
       json (>= 1.8.0)
 
@@ -174,6 +179,7 @@ DEPENDENCIES
   rails-assets-fontawesome (~> 4.1.0)
   rails-assets-jquery (~> 1.11.2)
   rails-assets-parsleyjs (~> 2.0.3)
-  rake (~> 10.3.2)
+  rake (~> 10.4.2)
+  therubyracer (~> 0.12.2)
   tzinfo-data
   wdm (~> 0.1.0)