Merge pull request #4468 from guilleiguaran/bump-sprockets-2-2

Bump Sprockets to 2.2.0 in master

actionpack/actionpack.gemspec

@@ -23,7 +23,7 @@
   s.add_dependency('rack',          '~> 1.4.0')
   s.add_dependency('rack-test',     '~> 0.6.1')
   s.add_dependency('journey',       '~> 1.0.0')
-  s.add_dependency('sprockets',     '~> 2.1.2')
+  s.add_dependency('sprockets',     '~> 2.2.0')
   s.add_dependency('erubis',        '~> 2.7.0')
 
   s.add_development_dependency('tzinfo', '~> 0.3.29')