Loosens ActiveSupport to 3 (#300)

* Loosens ActiveSupport to >= 3.0.0. Fixes #289

* Works around ActiveSupport<4 hash extensions not being auto-required for tests

* Readd FIXME in gemspec

Author: wwahammy

grape-entity.gemspec

@@ -18,7 +18,7 @@ Gem::Specification.new do |s|
 
   s.rubyforge_project = 'grape-entity'
 
-  s.add_runtime_dependency 'activesupport', '>=4.0'
+  s.add_runtime_dependency 'activesupport', '>= 3.0.0'
   # FIXME: remove dependecy
   s.add_runtime_dependency 'multi_json', '>= 1.3.2'
 

spec/spec_helper.rb

@@ -3,6 +3,12 @@
 require 'simplecov'
 require 'coveralls'
 
+# This works around the hash extensions not being automatically included in ActiveSupport < 4
+require 'active_support/version'
+require 'active_support/core_ext/hash' if ActiveSupport::VERSION &&
+                                          ActiveSupport::VERSION::MAJOR &&
+                                          ActiveSupport::VERSION::MAJOR < 4
+
 SimpleCov.start do
   add_filter 'spec/'
 end