device-specific methods moved to enum
Device.isEInk() method
Merge branch 'master' into ice-cream-sandwich

Conflicts:
	src/org/geometerplus/zlibrary/ui/android/library/ZLAndroidLibrary.java
ZLAndroidLibrary.Device => DeviceType
Merge branch 'master' into ice-cream-sandwich

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