Update to CocoaPods 0.31.1 and Bundler 1.6.1
Update ruby-version to 2.0.0-p451
Merge pull request #1866 from jonnolen/development

Update ruby-version to 2.0.0-p451
Merge branch 'upstream/development' into development
Removed initialise method on RKObjectMapping adding RKISO8601DateFormatter to default RKValueTransformer

 https://github.com/RestKit/RestKit/issues/1870