Initial commit
Update README.md
Add auth sample
Whitespace fix
Update README.md
Add Slideshow sample
Start implementation of Android client

not finished, sign-in works, albums are fetched in background, chromecast
API is initialized and receiver unit can be chosen
Cast implementation, AlbumGrid implementation

Cast implementation is finished.
AlbumGrid implementation in progress.
Preliminary grid implementation done
Finish first test implementation

Album display works and albums can be sent to Chromecast.
Lots of improvements still necessary.

Note: Album image display depends on UrlImageViewHelper by
https://github.com/koush/
Add reference to external libraries
Updated photocast sample
Add pluscast sample