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().
Improved doc.
Fixed typo.
Merge pull request #212 from crazymaster/master

Improved doc.
- Improved unite#get_status_string().
Update instruction for powerline custom theme
- Improved status string.