ruler added for 120 char length, gitgutter plugin added

vimrc

@@ -16,6 +16,7 @@ call vundle#begin()
 Plugin 'gmarik/Vundle.vim'
 
 " my plugins
+Plugin 'airblade/vim-gitgutter'
 Plugin 'ctrlpvim/ctrlp.vim'
 " Plugin 'elixir-lang/vim-elixir'
 Plugin 'ervandew/supertab'
@@ -65,6 +66,12 @@ let mapleader = "_"
 set number
 set ruler
 
+" ruler at 120 characters
+if (exists('+colorcolumn'))
+  set colorcolumn=120
+  highlight ColorColumn ctermbg=8
+endif
+
 " Set encoding
 set encoding=utf-8
 setglobal fileencoding=utf-8