Remove therubyracer, it's already a dependency of execjs

Gemfile

@@ -19,7 +19,6 @@ gem 'ruby-debug19'
 gem 'rubyzip'
 gem 'sinatra'
 gem 'sprockets'
-gem 'therubyracer' # For linux
 gem 'tinymce-rails'
 
 # Gems used only for assets and not required

Gemfile.lock

@@ -79,7 +79,6 @@ GEM
       actionpack (>= 3.0.0)
       activesupport (>= 3.0.0)
       railties (>= 3.0.0)
-    libv8 (3.3.10.4)
     linecache19 (0.5.12)
       ruby_core_source (>= 0.1.4)
     mail (2.3.0)
@@ -175,8 +174,6 @@ GEM
       rack (~> 1.0)
       tilt (~> 1.1, != 1.3.0)
     subexec (0.2.1)
-    therubyracer (0.9.9)
-      libv8 (~> 3.3.10)
     thor (0.14.6)
     tilt (1.3.3)
     tinymce-rails (3.4.8)
@@ -232,7 +229,6 @@ DEPENDENCIES
   sinatra
   spork
   sprockets
-  therubyracer
   tinymce-rails
   uglifier
   watchr