NetworkImage logic simplified
cookie db initialisation

Conflicts:
	src/org/geometerplus/android/fbreader/network/BookDownloaderService.java
Merge branch 'master' into nook
separate instance for Notifier
Merge branch 'master' into nook
code simplification + unique notification per download url
Merge branch 'master' into nook
better download book notification
updated ChangeLog
Merge branch 'master' into nook
delayed notification
Merge branch 'master' into nook