Switch vim colorscheme to gruvbox (#23)

.config/nvim/colors/bw.vim

@@ -0,0 +1,55 @@
+" Vim color file
+" Maintainer:   Hans Fugal <hans@fugal.net>
+" Last Change:  5 Oct 2001
+" URL:		http://fugal.net/vim/colors/bw.vim
+
+" cool help screens
+" :he group-name
+" :he highlight-groups
+" :he cterm-colors
+"
+if version > 580
+    " no guarantees for version 5.8 and below, but this makes it stop
+    " complaining
+    hi clear
+    if exists("syntax_on")
+	syntax reset
+    endif
+endif
+let g:colors_name="bw"
+
+hi SpecialKey     cterm=bold		ctermfg=NONE
+hi NonText        cterm=bold	    	ctermfg=NONE
+hi Directory      cterm=bold	    	ctermfg=NONE
+hi ErrorMsg       cterm=standout    	ctermfg=NONE
+hi IncSearch      cterm=reverse	    	ctermfg=NONE
+hi Search         cterm=reverse	    	ctermfg=NONE
+hi MoreMsg        cterm=bold	    	ctermfg=NONE
+hi ModeMsg        cterm=bold	    	ctermfg=NONE
+hi LineNr         cterm=underline   	ctermfg=NONE
+hi Question       cterm=standout    	ctermfg=NONE
+hi StatusLine     cterm=bold,reverse	ctermfg=NONE
+hi StatusLineNC   cterm=reverse 	ctermfg=NONE
+hi VertSplit      cterm=reverse		ctermfg=NONE
+hi Title          cterm=bold		ctermfg=NONE
+hi Visual         cterm=reverse		ctermfg=NONE
+hi VisualNOS      cterm=bold,underline	ctermfg=NONE
+hi WarningMsg     cterm=standout	ctermfg=NONE
+hi WildMenu       cterm=standout	ctermfg=NONE
+hi Folded         cterm=standout	ctermfg=NONE
+hi FoldColumn     cterm=standout	ctermfg=NONE
+hi DiffAdd        cterm=bold	        ctermfg=NONE
+hi DiffChange     cterm=bold	        ctermfg=NONE
+hi DiffDelete     cterm=bold	        ctermfg=NONE
+hi DiffText       cterm=reverse	        ctermfg=NONE
+hi Comment        cterm=bold	        ctermfg=NONE
+hi Constant       cterm=underline	ctermfg=NONE
+hi Special        cterm=bold		ctermfg=NONE
+hi Identifier     cterm=underline	ctermfg=NONE
+hi Statement      cterm=bold		ctermfg=NONE
+hi PreProc        cterm=underline	ctermfg=NONE
+hi Type           cterm=underline	ctermfg=NONE
+hi Underlined     cterm=underline	ctermfg=NONE
+hi Ignore         cterm=bold		ctermfg=NONE
+hi Error          cterm=reverse		ctermfg=NONE
+hi Todo           cterm=standout	ctermfg=NONE