Quit popup, NPSAppManaged and TERM
Quit popup, NPSAppManaged and TERM

Main class (App) now extends NPSAppManaged, and forms are added in
kosher way. Quit popup is also implemented and available upon
pressing `q` key (`Q` key too!).

Additionally, application sets TERM env variable to proper value
(`xterm`) in order for colors to properly show up under tmux.

modrzew/ekoie