Version 3.0

- add Scheme (fetch from Kuler/ColorLover, fav, edit, new)
- see detail in https://github.com/Rykka/colorv.vim#done
Version 3.0.1

  - fix debug message: miss cache file.
  - fix scheme navigation with key.
  - update image.
Version 3.0.2

  - add back_buf for all win.
  - add scheme fetch info.
  - fix scheme nav arrow pos.