Enable tabline
Close NERDTREE when it's the last pane

Source project.vim files automagically
Merge branch 'master' of https://github.com/bahlo/dotfiles

* 'master' of https://github.com/bahlo/dotfiles:
  Add .vim-project, new maps for NERDTree and Tagbar

Conflicts:
	vim/vimrc.symlink
Add relative numbering