Support for classify menu, submenu not implemented yet
Follow perlstyle
Split out ``scp'' routine: spawn_scp()
Make all main process into main() subroutine
Fix mosh with specific ssh port problem, thanks to iamben
Split user_input() and parse_cmd() into subroutines
Remove unnecessary "next"
Refine parse_cmd() subroutine
Use placeholder in printf
Support classify menu / selection

- display classify menu when user select an class
- use 'qq' to quit classify menu, and back to main menu
- pattern matching still use all sites in known_hosts as database, not
  sure if I should restrict it to the class where user is in
Move global variables to the top of program
Perlstyle tuning

- Tune subroutine ordering to prevent '&' symbol
- Fix subroutine prototype
- Use spaces instead of TABs in indention
Add version number
Use `..' and `../' will also go back to main menu
Follow perlstyle: align assignment
Remove old commented code
Add README.md
Output version with `-v', `--version' option

- Bump version to 0.9