Extended styling suppport

Thanks for updating the library for Android 5 support. I've added a few extra options to your version, for my own use really but thought you might like to merge them in.

* ColorStateList support for text colour
* Change text style (normal, bold, italic)
* Change text alpha

All defaults should be the same as before.
Yep - this is definitely required, I noticed it messed up the colours of the sample.