Someone should maintain vim-easymotion

hi @Lokaltog and other vim-easymotion users

I forked vim-easymotion and improve it based on supasorn's and others' work.

Try this: [haya14busa/vim-easymotion](https://github.com/haya14busa/vim-easymotion)

### New feature
- Two key combo (supasorn's work)
- bidirectional motion (supasorn's work)
- smartcase
- jumptoanywhere
- etc ...

New feature is basically turned off except two key combo and bidirectional motion,
so the users could easily move new version.

### Bug fix
- bufname bug
- multibyte handling
- visual mode selection bug (o command)
- undo history
- etc...

I know you are working on Python-based version, but I think it's good to merge brilliant feature(e.g. suparon's one) and at least some bug fix pull-request.

I love Easymotion, this plugin is great!

Thanks