cleanup (removing some old and unused files)
Merge branch 'master' of https://github.com/ftzeng/dippindots

* 'master' of https://github.com/ftzeng/dippindots:
  removed powerline from dippindots install script
  removing powerline, replacing it with vim-airline
  added vim scala
  added visual mode mapping too
  better mapping for NERDCommenter toggle (ctrl+x)
  cleanup
  added ctrl+l to list buffers