1. [Feature] New indicator for markdown/org preview with grip.
2. Fix #206: Don't display overwrite state when evil-mode is enabled.
3. [Optimize] Cache window font width.
4. [Optimize] just update the face of the buffer name in `after-change-functions'.
5. PR #217: Refresh buffer status after `not-modified'.
6. Display minor modes if minions is installed.
7. Display correct buffer state after saving org src block.
8. Misc improvements.