cleanup
PluginFileOpener => ExternalFileOpener
synchronization with beta branch
Merge branch 'master' into beta

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