Remove trailing whitespace

Soooo I have my editor configured to trim trailing whitespace, and
there's a lot, and I'm tired of having to make sure my commits aren't
noisy.

So I used a script to remove trailing whitespace from all files with
extensions erb, haml, html, js, md, rake, rb, sass, txt, and yml.
Merge pull request #67 from carols10cents/no_trailing_whitespace

Remove trailing whitespace