request query (in progress)
clean toString() method for Book
fixed Book object creation
Fixed Ukrainian hyphenations
Merge branch 'master' into query
query serialization/deserialization (in progress)
query deserialization (in progress)
filter serialization/deserialization (in progress)
fixed missing paragraph issue
Merge branch 'master' into beta

Conflicts:
	ChangeLog
updated external library/bookmarks call logic
Merge branch 'master' into beta
Merge branch 'master' into query
first usages of filters: by series & by author
more filter usages: IBookCollection.titles() method
FilteredTree
Filter.ByTitlePrefix
Filter.ByTag (in progress)
book for pattern
Filter.ByTag