Switch vim colorscheme to gruvbox (#23)

.config/nvim/colors/stefan.vim

@@ -0,0 +1,40 @@
+"%% SiSU Vim color file
+" Stefan Maintainer: Stefan Nelson-Lindall <bethebunny@gmail.com>
+" (originally looked at Slate by Ralph Amissah <ralph@amissah.com>, 8/9/2012)
+:set background=dark
+:highlight clear
+if version > 580
+ hi clear
+ if exists("syntax_on")
+ syntax reset
+ endif
+endif
+let colors_name = "stefan"
+:hi clear Normal
+:hi SpecialKey ctermfg=darkgreen
+:hi Statement ctermfg=brown
+:hi Keyword ctermfg=cyan cterm=none
+:hi Label ctermfg=cyan cterm=bold
+:hi Visual cterm=reverse
+:hi String ctermfg=red cterm=bold
+:hi Comment ctermfg=blue cterm=none
+:hi Constant ctermfg=red cterm=none
+:hi Special ctermfg=darkgreen
+:hi Identifier ctermfg=red
+:hi Include ctermfg=magenta cterm=none
+:hi PreProc ctermfg=red
+:hi PreCondit ctermfg=red cterm=none
+:hi Operator ctermfg=Red cterm=none
+:hi Define ctermfg=yellow cterm=bold
+:hi Type ctermfg=green cterm=bold
+:hi Typedef ctermfg=magenta cterm=bold
+:hi StorageClass ctermfg=darkgreen
+:hi Function ctermfg=blue cterm=bold
+:hi Structure ctermfg=green cterm=bold
+:hi LineNr ctermfg=brown
+:hi Ignore ctermfg=white
+:hi Todo ctermbg=Yellow
+:hi Debug ctermfg=LightGray
+:hi Pmenu ctermfg=grey ctermbg=magenta
+:hi PmenuSel ctermfg=magenta ctermbg=grey
+:autocmd BufEnter * if &readonly | hi StatusLine ctermfg=Red | else | hi StatusLine ctermfg=Cyan | endif