RTable: refactoring

fix cell memory leak
RTable: string view
RTable: encode/decode
RTable: persistence
RTable: NSString extensions
RTable: cell and table models
RTable: UITableView extensions
RTable: cell view
RTable: update main view
RTable: update view controller
RTable: update app delegate
RTable: NSBundle extensions
RTable: fill cell from model
RTable: refactoring
RTable: archive