Fix bad links in the documentation breakout
Bump dependencies to fix build
Fix issue with objectManager references in test helper
Add conditional compilation around `connectionTestExpectation` to avoid unused variable warning
Fix inability to complete value transformations when using a nested mapping. closes #1656
Bump version to 0.22.0
Update RKValueTransformers to v1.0.1
Update TransitionKit dependency to 2.0
Update CocoaPods to 0.28.0
Bump Pod dependencies
Add support for serializing values to null. closes #669, closes #1311
Bump TransitionKit ref
Fix test breakage from inclusion of milliseconds in ISO 8601 date output
Add TKTransition to the project so static library and framework will build standalone
Fix warning
Conditionalize tests for OS X
Switch to release version of xctool to fix Travis build errors
Merge branch 'release/0.22.0'
Enable `GCC_WARN_64_TO_32_BIT_CONVERSION` warning
Respect `assignsDefaultValueForMissingAttributes` when mapping `nil` values

* Set `assignsDefaultValueForMissingAttributes` to `YES` for request mappings to enable serialization to NSNull