fix ctrlp to only show git tracked files

vim/vimrc.symlink

@@ -421,10 +421,12 @@ let g:syntastic_typescript_checkers = ['tslint']
 let g:syntastic_javascript_checkers = ['jshint', 'jscs']
 
 " CtrlP ignore patterns
-let g:ctrlp_custom_ignore = {
-            \ 'dir': '\.git$\|node_modules$\|bower_components$\|\.hg$\|\.svn$',
-            \ 'file': '\.exe$\|\.so$'
-            \ }
+" let g:ctrlp_custom_ignore = {
+"             \ 'dir': '\.git$\|node_modules$\|bower_components$\|\.hg$\|\.svn$',
+"             \ 'file': '\.exe$\|\.so$'
+"             \ }
+" only show files that are not ignored by git
+let g:ctrlp_user_command = ['.git/', 'git --git-dir=%s/.git ls-files -oc --exclude-standard']
 
 " search the nearest ancestor that contains .git, .hg, .svn
 let g:ctrlp_working_path_mode = 2