added exercises to ruby for beginners slides
fixed merge conflicts
Fixed broken Heroku version check step.
Update sites/installfest/osx_lion.step
Update sites/installfest/clean_up.step
fixed various non-code typos, grammar items, styling
Merge branch 'patch-3' of https://github.com/evilzero/docs into evilzero-patch-3
Merge branch 'master' of https://github.com/ellesuzuki/docs into ellesuzuki-master
Merge pull request #105 from jessieay/master

added-exercises-to-beginner-slides