release_1.7

Material design and few fixes

Material design for supported devices:
- apply material theme everywhere
- ripples
- coloured system bars
- elevation
- new progress bar
- define layouts for lollipop (21)
- fix splash screen on material theme

General changes:

- remove rotate button from action bar and the animation
- add rotate button inside overflow menu
- add new preference: material palette website
- simplify info preferences: remove icons.
- define new info preferences holo style for pre-lollipop devices