more experiments with SynchroniserService
Merge branch 'master' into ice-cream-sandwich
static thread variable
introduced ZLNetworkContext
Merge branch 'master' into ice-cream-sandwich

Conflicts:
	src/org/geometerplus/android/fbreader/network/action/OpenCatalogAction.java
	src/org/geometerplus/android/fbreader/network/action/ReloadCatalogAction.java
	src/org/geometerplus/android/fbreader/network/action/ShowBookInfoAction.java