Merge pull request #45 from blueyed/use-nowait-mappings
Use `<nowait>` with mappings
Only popup error message when user want's to open the undotree window
Fixed some small issue.
Real updated highlight for changed text.
Added saved status, relative timestamp and ability of clear undo hist…
Add diff panel. Performance improvement.
Fixed some annoying issues.
Added some new features, and fixd some bugs.