Add `<leader>gw :Gwrite<CR>` mapping to Readme
Merge branch '3.0' of https://github.com/spf13/spf13-vim into 3.0

* '3.0' of https://github.com/spf13/spf13-vim:
  Add `<leader>gw :Gwrite<CR>` mapping to Readme
add plum colorscheme
monokai colorscheme