Add coverage status badge in README

Also use shields.io for flat style badges
Reorder README sections
Fix typo
Make it very clear that XCDYouTubeKit is against the YouTube ToS
Use the master branch for build and coverage status
Add platform, pod version and license badges
Update CHANGELOG
Update demo projects version to 2.0.2
Update version to 2.0.2
Merge branch 'release/2.0.2' into develop
Upgrade to Xcode 6 recommended settings
Add default "XCDYouTubeKit iOS Framework" target

Also rename "XCDYouTubeKit iOS" into "XCDYouTubeKit iOS Static Library"
Cleanup versions settings

Use settings defined at the project level instead, they are shared between the iOS and OS X frameworks targets.
Cleanup "Deployment" settings
Cleanup "Linking" settings
Cleanup "Apple LLVM 6.0 - Code Generation" settings
Cleanup "Apple LLVM 6.0 - Preprocessing" settings
Cleanup warnings settings
Cleanup "Apple LLVM 6.0 - Language - C++" settings
Fill "Compile Sources", "Link Binary With Libraries" and "Headers" build phases