Add webmock to alternative gemfiles

gemfiles/Gemfile.rails3.2

@@ -24,6 +24,7 @@ end
 
 group :test do
   gem 'sqlite3', :platform => [:ruby, :mswin, :mingw]
+  gem 'webmock'
 
   platforms :ruby do
     gem 'pg'

gemfiles/Gemfile.rails4.1

@@ -24,6 +24,7 @@ end
 
 group :test do
   gem 'sqlite3', :platform => [:ruby, :mswin, :mingw]
+  gem 'webmock'
 
   platforms :ruby do
     gem 'pg'

gemfiles/Gemfile.ruby1.9.3

@@ -16,6 +16,7 @@ group :development, :test do
   gem 'test-unit' # install newer version with omit() method
 
   gem 'debugger'
+  gem 'webmock'
 
   platforms :jruby do
     gem 'jruby-openssl'