Merge pull request #166 from maxgoedjen/master

Pipe error into tmpError when serializing child objects.
Use the predefined mtl_valueMappingTransformerWithDictionary in the README rather than handling the enum dictionary manually
Merge pull request #179 from dcaunt/readme-state-transformer

Use the predefined mtl_valueMappingTransformerWithDictionary in the README
Removed empty line
Merge pull request #180 from dcaunt/readme-state-transformer

Removed empty line
++xcconfigs
Remove RunUnitTests scripts

Not supported in Xcode 5's `xcodebuild`.
Merge pull request #181 from github/fix-xcodebuild

Remove RunUnitTests scripts
++xcconfigs
Update objc-build-scripts
Don't pass in -sdk (for Travis)
Revert "Don't pass in -sdk (for Travis)"

This reverts commit f4633f60bafd4dcc0370aaed15bf4eb4174dbf5a.
Update objc-build-scripts
Merge pull request #182 from github/xctool

Build with xctool
++xcconfigs for arm64 support

CC @bdolman
Include 64-bit build in iOS library

Remove the explicit ARCHS override for the iOS target in favor of using
the default base configuration ARCHS that includes 64-bit support.
Merge pull request #186 from bdolman/master

Include 64-bit build in iOS library
++xcconfigs
++specta, ++expecta for arm64 support
Merge pull request #192 from github/arm64

Update dependencies for arm64 tests