PreferenceSet refactoring
Merge branch 'master' into beta
PreferenceSet.Reloader (in progress)
Merge branch 'master' into beta

Conflicts:
	src/org/geometerplus/android/fbreader/preferences/PreferenceActivity.java
PreferenceSet.Reloader usages
Merge branch 'master' into beta

Conflicts:
	src/org/geometerplus/android/fbreader/preferences/PreferenceActivity.java
BoundPref technique has gone