Merge pull request #202 from zhaocai/master

Fix mru code
- Fixed auto_quit behavior.
Fixed validate code
- Fixed log behavior.
- Fixed <Plug>(unite_delete_backward_char).
- Deleted startinsert in cursor moved.
Fixed tag.
Merge pull request #205 from crazymaster/master

Fixed tag.
- Fixed self.mtime().
- Improved mru source.
- Improved mru sources.
- Fixed load scripts.
- Improved python3 check.
- Uniq mru list in save.
- Uniq mru list in save.
- Fixed mru loading error.
- Fixed loading sources problem.
- Fixed initialization.
- Fixed error.
- Fixed redraw_echo().