added books model and file uploads
rack gem changed to 1.4.1
1.modified navbar in user_area layout 2.added helpers for menu
1.added background job support (resque); 2.installed redis
improved organization of classes in lib/ folder
improved cut_to_pieces method (now gives offsets and lengths)
highly improved tokenizing speed; todo: fix newline pieces
1.cut_to_pieces is now Slicer class; 2.sentence detection accuracy and speed improved
creating and retrieving indexes
finished indexes mechanism