Implements mongodb migrations based on yii's migrate command
Added toc to readme file to provide a better overview
Fixed config example in docs
Added database migration section to readme
Changed readme line endings to \n
Keep consistence
Removed [toc] as it is not supported by GFM
Merge pull request #193 from tvollstaedt/mongomigration

Added migrate command for mongodb migrations
Cleaned up readme a little
Fiuxed readme header redirection
Fixed rahil's name encoding