Rename demo project
Delete unnecessary comments
OS X Demo app stub
Add preventive warnings for iOS 7 and OS X 10.9 deployment target
Percent-escape parts of URLs constructed manually
Add OS X framework + OS X unit tests targets
Add unit test for non-existent video
Hide the private `XCDYouTubePlayerScript` class to the linker
Simplify `languageIdentifier` method code
Replace `\n` with ` ` in error description
Test localized error descriptions
Add unit test for french client
Support for live videos

Fixes #34