Add functions and files for BEM and HTML Tidy to show how we could tackle #8 and #9
Add in a a slightly refactored version of Pete's body_class filter from FG
We don't need the custom classes parameter as we can add our own classes on the body_class filter and it'll be retained
Alters a comment and removes an extra carriage return
Add back custom classes
Remove the echo and just include a file with a comment
Prefix bem so that it's collaborate-bem
Merge pull request #10 from peterwilsoncc/BQ/html-tidy

First pass of getting functions and files in place for work on #7 and #8