Temp directory option
clear book cache on book re-opening
Merge branch 'master' into ice-cream-sandwich

Conflicts:
	src/org/geometerplus/android/fbreader/FBReader.java
Merge branch 'master' into beta

Conflicts:
	src/org/geometerplus/android/fbreader/preferences/PreferenceActivity.java
Merge branch 'beta' into beta-ics

Conflicts:
	src/org/geometerplus/android/fbreader/FBReader.java
Merge branch 'ice-cream-sandwich' into beta-ics