Switch vim colorscheme to gruvbox (#23)

.config/nvim/colors/sonofobsidian.vim

@@ -0,0 +1,43 @@
+" Port of http://studiostyles.info/schemes/son-of-obsidian
+" 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="sonofobsidian"
+
+
+hi Comment          guifg=#99AA8A
+hi Normal           guifg=#FFFFFF guibg=#22282A
+hi CursorLine       guibg=#32383A
+hi CursorColumn     guibg=#32383A
+hi Search           guibg=#808080
+hi Visual           guifg=#FFFFFF guibg=#4F6164 
+hi VisualNOS        guifg=#FFFFFF guibg=#4F6164 
+hi Identifier       guifg=#FFFFFF
+hi Number           guifg=#FFCD22 
+hi Operator         guifg=#E8E2B7 
+hi String           guifg=#EC7600 
+hi FoldColumn       guifg=#FFFFFF guibg=#394144
+hi LineNr           guifg=#3F4E49 guibg=#293134 
+hi PreProc          guifg=#A082BD 
+hi Keyword          guifg=#93C763
+hi Conditional      guifg=#93C763
+hi Statement        guifg=#93C763
+hi Type             guifg=#93C763
+hi Structure        guifg=#678CB1 
+hi Tag              guifg=#93C763
+hi xmlTagName       guifg=#93C763
+hi xmlCdata         guifg=#99A38A
+hi xmlAttrib        guifg=#678CB1
+hi htmlTagName      guifg=#93C763
+hi htmlArg          guifg=#678CB1
+hi ErrorMsg         guifg=#FF0000
+hi WarningMsg       guifg=#FFCD22
+hi Folded           guifg=#808080 guibg=#1C2325
+hi PMenu            guifg=#CCCCFF guibg=#1C2325
+hi PMenuSel         guibg=#2C3335
+