Switch vim colorscheme to gruvbox (#23)

.config/nvim/colors/umber-green.vim

@@ -0,0 +1,89 @@
+" Vim color file
+" Maintainer:   horrorvacui-at-gmx.net
+" Last Change:  today... oh yes, it's 16.9.03
+" URL:		
+
+" cool help screens
+" :he group-name
+" :he highlight-groups
+" :he cterm-colors
+
+" your pick:
+set background=dark	" or light
+hi clear
+if exists("syntax_on")
+    syntax reset
+endif
+let g:colors_name="umber-green"
+
+"hi Normal
+
+" OR
+
+" highlight clear Normal
+" set background&
+" highlight clear
+" if &background == "light"
+"   highlight Error ...
+"   ...
+" else
+"   highlight Error ...
+"   ...
+" endif
+
+" A good way to see what your colorscheme does is to follow this procedure:
+" :w 
+" :so % 
+"
+" Then to see what the current setting is use the highlight command.  
+" For example,
+" 	:hi Cursor
+" gives
+"	Cursor         xxx guifg=bg guibg=fg 
+ 	
+" Uncomment and complete the commands you want to change from the default.
+
+hi Cursor	guibg=#ffffff	
+"hi CursorIM	
+"hi Directory	
+"hi DiffAdd		
+"hi DiffChange	
+"hi DiffDelete	
+"hi DiffText	
+"hi ErrorMsg	
+"hi VertSplit	
+"hi Folded		
+"hi FoldColumn	
+"hi IncSearch	
+hi LineNr	guifg=#e2844d guibg=#000000
+"hi ModeMsg		
+"hi MoreMsg		
+"hi NonText		
+"hi Question	
+"hi Search		
+"hi SpecialKey	
+hi StatusLine	guifg=#ffffff
+hi StatusLineNC	guifg=#ffffff
+"hi Title		
+"hi Visual		
+"hi VisualNOS	
+"hi WarningMsg	
+"hi WildMenu	
+"hi Menu		
+"hi Scrollbar	
+"hi Tooltip		
+
+" syntax highlighting groups
+hi Normal guifg=#eeaa11 guibg=#333333
+hi Comment guifg=#ff5555
+hi Constant	guifg=#eeaa11
+hi Identifier	guifg=#0000ff
+hi Statement	guifg=#77ee44
+hi PreProc	guifg=#ff0000
+hi Type		guifg=#eecc88
+hi Special	guifg=#ddffcc
+"hi Underlined	
+"hi Ignore		
+"hi Error		
+"hi Todo		
+