introduced AndroidImageSynchronizer
Merge branch 'master' into beta

Conflicts:
	src/org/geometerplus/android/fbreader/library/BookInfoActivity.java
Merge branch 'master' into ice-cream-sandwich
Merge branch 'beta' into beta-ics
Merge branch 'ice-cream-sandwich' into beta-ics
Merge branch 'ice-cream-sandwich' into yota2
Merge branch 'beta-ics' into betayota
Merge branch 'yota2' into betayota
conections pool
Merge branch 'master' into beta
Merge branch 'master' into ice-cream-sandwich
Merge branch 'beta' into beta-ics
Merge branch 'ice-cream-sandwich' into beta-ics
Merge branch 'ice-cream-sandwich' into yota2
Merge branch 'beta-ics' into betayota
Merge branch 'yota2' into betayota
refactoring: PluginConnectionPool => AndroidImageSynchronizer
Merge branch 'beta' into beta-ics
Merge branch 'beta-ics' into betayota
simplification: PluginMetainfoReaderImpl & AndroidImageSynchronizer merged into one class