Update nerd tree ignores

.DS_Store, .vim, *.d, .rbc. ~
Merge pull request #1 from ryansouza/patch-1

Update nerd tree ignores
Add vim-golang plugin.
Only disable ballooneval when gui_running so terminal vim doesn't get angry.
Fix slowdowns

- force git gutter to only updating the current tab
- force set balloon tooltip expr to syntastic,
  vim-ruby was setting on ruby files