Fix wrong error logging
Use custom date formatter on attribute mapping when available
Add test case for serialize date using an attribute mappings valueTransformer
Merge pull request #1850 from freddietilley/development

Use custom date formatter on attribute mapping when available
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
Update CocoaPods to 0.32.1
Update Value Transformer Dependencies
Merge pull request #1752 from djmadcat/development

Fix wrong error logging (probably copy-paste error)
Merge remote-tracking branch 'upstream/development' into development-upstream