Add new keystroke / shortcut bash style

[daniele77]

(From discussion #151 )

Some examples:

C-a Move to the start of the line.
C-e Move to the end of the line.
M-f Move forward a word, where a word is composed of letters and digits.
M-b Move backward a word.
C-l Clear the screen, reprinting the current line at the top.
C-k Kill the text from the current cursor position to the end of the line.
C-u Kill the text from the current cursor position to the beginning of the line.
C-r search on the history
C-d Exit.