* factor out HockeyAppClient
* configure Authenticator with HockeyAppClient
* move appendPostValue to HockeyAppClient (& add the missing boundary parameter)
* move tests over to new file
- Added SFHFKeyChainUtils with BIT prefix
- Save username, email or userid (if provided by the app or the user) in the keychain instead of user defaults or property files
- Use one common static lib target
- create embeddedFramework as binary distribution including docset in one zip
- Add HockeySDK.xcconfig for easier build setting setup
- Move everything into a single directory, too many problems making binary and subproject work without requing recursive header search paths
- Documentation update pending
