New layout implemented
Fixed duplicated id
Minor layout changes
Bugfix: Now its possible to go back to main menu.
Layout and Settings modifications. See description

* Settings are fully functional
* Added background to splash, menu and game activity
* Added background to the board
* Minor score layout changes
Added alternation of the first player for each board.
Merge pull request #33 from KB50-G1/feature/settingsActivity

Feature/settings activity