Initial commit
Add mongodb-10gen formula

* Reference: http://docs.mongodb.org/manual/tutorial/install-mongodb-on-ubuntu/
Update folder structure to fit salt-formula
Add 'srv/salt/mongodb-10gen/' from commit '35c19c8fe105c83a6c75f23576f32253333c90cf'

git-subtree-dir: srv/salt/mongodb-10gen
git-subtree-mainline: c8698726ab22837b2f110ade9766a48c7484500e
git-subtree-split: 35c19c8fe105c83a6c75f23576f32253333c90cf