Re-add bacon development dependency

cocoapods.gemspec

@@ -29,6 +29,7 @@ Gem::Specification.new do |s|
                            "you are upgrading, first run: $ pod setup"
 
   s.add_runtime_dependency 'xcodeproj', '~> 0.1.0'
+  s.add_development_dependency 'bacon', '~> 1.1'
 
   ## Make sure you can build the gem on older versions of RubyGems too:
   s.rubygems_version = "1.6.2"