Add combo keys control+n/p/h/[ for move down/move up/delete/esc
Directly call delegate method to avoid system sound.
Bug fix: selectedRow is -1 when tableview has no selection.
Merge pull request #25 from Igotit/master

Add combo keys control+n/p/h/[ for move down/move up/delete/esc
Allow searching '+' and '_' characters