Add support for vim-gitgutter

[ghost]

Adds support for the vim-gitgutter plugin.

Solves issue #172 ?

Screenshots: Light Theme

Dark Theme

Light Theme (:GitGutterLineHighlightsEnable)

Dark Theme: (:GitGutterLineHighlightsEnable)

[NLKNguyen]

Thanks. I don't know about this plugin, but I'm wondering if the :GitGutterLineHighlightsEnable highlight should be more like the vimdiff for added lines? Like this:

[hellovimo]

Hello ! I tried the above changes..

1. After setting the gitgutterlinehighlightsenable, when I open any git file which is been edited, the gvim first prints some weird numbers as shown below onto the screen and then opens up the file. After opening the file, I do see the lines are highlighted as shown above. Any guess what could be the issue ?

H\ue0b0 31H    31H \ue0b231H Bufs 31H1;0M 1 31H ~ 3;0M~ 4;0M~ 5;0M~ 6;0M~ 7;0M~ 8;0M~ 9;0M~ 10;0M~ 11;0M~ 12;0M~ 13;0M~ 14;0M~ 15;0M~ 16;0M~ 17;0M~ 18;0M~ 19;0M~ 20;0M~ 21;0M~ 22;0M~ 23;0M~ 24;0M~ 31H25;0M 

[NLKNguyen]

@hellovimo does that only happen with that gitgutter setting? and how about when you open in terminal Vim?

[hellovimo]

Hello @NLKNguyen

1. This is happening when I open it in gvim and also in terminal VIM.
2. It just happens when I enable the :GitGutterLineHighlightsEnable and then open a modified git file. Then it throws up this weird numbers and then opens the file. Once the file it opened it shows that line highlight is happening as needed.
3. But its just weird that such random numbers gets throws and it's disturbing.

[NLKNguyen]

That's strange. Does that happen only with PaperColor theme?