introduced YotaSwitchScreenAction
yota string resources
BooleanOption instead of boolean variable
YotaDrawOnBackScreen option
Merge branch 'ice-cream-sandwich' into yota

Conflicts:
	src/org/geometerplus/android/fbreader/YotaSwitchScreenAction.java
	src/org/geometerplus/zlibrary/ui/android/library/ZLAndroidLibrary.java