TODO list:
 * add more special inputs. like: date => 04/10/2007; time => 10:50 AM.
 * add abbrev input support. like: IMHO => In My Humble Opinion; ASAP => As Soon As Possible.
 * implement python wrapper for Helper, Filter, FrontEnd and Config module.
 * PinYin
  * Add some special table.
  * Add a user phrase edit tool. 
