Add ActiveSupport dependencies to gemspec.

cocoapods.gemspec

@@ -32,6 +32,9 @@ Gem::Specification.new do |s|
                            "    $ sudo macgem install rubygems-compile\n" \
                            "    $ sudo macgem compile cocoapods\n\n"
 
+  s.add_runtime_dependency 'activesupport', '~> 3.1.1'
+  s.add_runtime_dependency 'i18n', '~> 0.6.0' # only needed for ActiveSupport :-/
+
   ## Make sure you can build the gem on older versions of RubyGems too:
   s.rubygems_version = "1.6.2"
   s.required_rubygems_version = Gem::Requirement.new(">= 0") if s.respond_to? :required_rubygems_version=