Add a bundler Gemfile for testing purpose

Gemfile

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+source "http://rubygems.org"
+
+gemspec
+
+gem 'refinerycms', '~> 2.0.0'
+
+group :development, :test do
+  require 'rbconfig'
+
+  gem 'refinerycms-testing', '~> 2.0.0'
+
+  platforms :jruby do
+    gem 'activerecord-jdbcsqlite3-adapter'
+    gem 'activerecord-jdbcmysql-adapter'
+    gem 'activerecord-jdbcpostgresql-adapter'
+    gem 'jruby-openssl'
+  end
+
+  unless defined?(JRUBY_VERSION)
+    gem 'sqlite3'
+    gem 'mysql2'
+    gem 'pg'
+  end
+
+  platforms :mswin, :mingw do
+    gem 'win32console'
+    gem 'rb-fchange', '~> 0.0.5'
+    gem 'rb-notifu', '~> 0.0.4'
+  end
+
+  platforms :ruby do
+    gem 'spork', '0.9.0.rc9'
+    gem 'guard-spork'
+
+    unless ENV['TRAVIS']
+      if RbConfig::CONFIG['target_os'] =~ /darwin/i
+        gem 'rb-fsevent', '>= 0.3.9'
+        gem 'growl',      '~> 1.0.3'
+      end
+      if RbConfig::CONFIG['target_os'] =~ /linux/i
+        gem 'rb-inotify', '>= 0.5.1'
+        gem 'libnotify',  '~> 0.1.3'
+        gem 'therubyracer', '~> 0.9.9'
+      end
+    end
+  end
+
+  platforms :jruby do
+    unless ENV['TRAVIS']
+      if RbConfig::CONFIG['target_os'] =~ /darwin/i
+        gem 'growl',      '~> 1.0.3'
+      end
+      if RbConfig::CONFIG['target_os'] =~ /linux/i
+        gem 'rb-inotify', '>= 0.5.1'
+        gem 'libnotify',  '~> 0.1.3'
+      end
+    end
+  end
+end
+
+# Refinery/rails should pull in the proper versions of these
+group :assets do
+  gem 'sass-rails'
+  gem 'coffee-rails'
+  gem 'uglifier'
+end
+
+gem 'jquery-rails'