refactoring: no dependency fbreader => text view (in progress)
Merge branch 'intro' into intro-ics
FBReaderSpecialEntry => ExtensionEntry
code simplification
BookElementsHolder (in text view) => BookElementManager (in fbreader.fbreader)
Merge branch 'master' into intro

Conflicts:
	src/org/geometerplus/fbreader/fbreader/BookElementManager.java
Merge branch 'intro' into intro-ics
Merge branch 'master' into ice-cream-sandwich
Merge branch 'ice-cream-sandwich' into yota2
Merge branch 'yota2' into intro-ics