Add master header file for XNGAPIClient
Adapt README for master header file
Use master header file in example project
Use master header file in tests
Merge pull request #12 from m0rk/master

Add umbrella header
Rename XINGAPI to XNGAPI

/cc @toco
Rename import in tests too
Add Gemfile
Add OS ENV variable for running test under iOS 6.1 and 7.0
Use xcodebuild and xcpretty for testing
Rename umbrella header in README too
Merge pull request #13 from xing/xcpretty

Switch from XCTest to xcpretty