Update 2013-12-10-vim-as-a-design-tool.md

Very minor changes that you should feel free to ignore.  PR will have some more substantive comments
Merge branch 'patch-2' of github.com:davetron5000/x--x into davetron5000-patch-2

* 'patch-2' of github.com:davetron5000/x--x:
  Update 2013-12-10-vim-as-a-design-tool.md