initial version with podfile and running unit test
refactoring: share common tests between iOS and OSX
remove compiler and analyzer warnings
minimal version of TransitWebViewContext
pull up common code of WebView-based TransitContext into TransitAbstractWebViewContext
first version of shared tests between iOS and OSX
generalizing most of iOS-specific tests to be executable on OSX, too
refactoring: distinguish targets with TRANSIT_OS_MAC and _IOS
OSX TransitContext delegate tests
update to cocoapods 0.21.0
build script for OSX
specific blocks only supported on 10.8+
integrate build for OSX into travis build