Update rails to 3.2.13

See http://weblog.rubyonrails.org/2013/3/18/SEC-ANN-Rails-3-2-13-3-1-12-and-2-3-18-have-been-released/
Add new tomatoes logo to index
Add OSS advertising box

See https://news.ycombinator.com/item?id=5468772
Update mocha

See https://github.com/freerange/mocha/issues/132
bump version number to 0.6.66
Merge branch 'release/0.6.66' into develop