Switch vim colorscheme to gruvbox (#23)

.config/nvim/colors/selenitic.vim

@@ -0,0 +1,38 @@
+" Port of http://studiostyles.info/schemes/selenitic
+" to vim
+" Last Change: 2010 sep 28
+" Version: 1.0
+set background=dark
+hi clear
+if exists("syntax_on")
+    syntax reset
+endif
+let g:colors_name='selenitic'
+
+hi Comment      guifg=#7A987A
+hi Normal       guifg=#DFDFBF guibg=#333333
+hi CursorLine   guibg=#434343
+hi CursorColumn guibg=#434343
+hi Visual       guibg=#486A65
+hi VisualNOS    guibg=#486A65
+hi Number       guifg=#6E96BE
+hi String       guifg=#DFAF8F
+hi Structure    guifg=#8ACCCF
+hi Type         guifg=#8ACCCF
+hi FoldColumn   guibg=#F0F0F0 guibg=#333333
+hi LineNr       guifg=#7A987A guibg=#333333
+hi PreProc      guifg=#EFC986
+hi Keyword      guifg=#EFC986
+hi Conditional  guifg=#EFC986
+hi Statement    guifg=#EFC986
+hi htmlArg      guifg=#DFDFBF
+hi htmlTagName  guifg=#EFC986
+hi xmlCdata     guifg=#808080
+hi xmlTagName   guifg=#EFC986
+hi ErrorMsg     guifg=#EFC986
+hi WarningMsg   guifg=#7A987A
+hi Folded       guifg=#808080
+hi Search       guibg=#505050
+hi PMenu        guifg=#CCCCFF guibg=#232323
+hi PMenuSel     guibg=#303030
+