Library: Introduce ButterKnife

@Harry-Chen @fython you may import the library to Eclipse/AndroidStudio
following this guide: http://jakewharton.github.io/butterknife/, and you
may need the pre-compiled jar library for IDEs.

Long long live our great Makefile!

Great thanks to Jake Wharton for such an amazing library: https://github.com/JakeWharton/butterknife

Signed-off-by: Peter Cai <xqsx43cxy@126.com>