Account working for user

Update 0.2:
- allow user to create new account [insert new account into account_info
in database file]
- allow user to delete account [delete specific account]
- allow user to switch account that want to work with [change current
view&working account]
- update some gui

issue not fix:
- Directory not working on Mac OS X
(Linux and other OS not testing yet, no confirm of working)