Update to vimb-2.0.

Changes:
 o New keybinding handling
 o Removed various ex-commands (for more information please give a look to
 NORMAL MODE COMMANDS in vimb(1) or RTFS src/normal.c)
 o Various bug fixing and improvements

For a complete list of changes please read:

 http://sourceforge.net/mailarchive/message.php?msg_id=31668680