rinari repository not up to date with rails

Hi,

`rinari` isn't actually working well with `rails 3/4` and one of the reasons might be that there're no updates for the last 5 years. 

the `rinari` fork https://github.com/eschulte/rinari is well maintained by @purcell, maybe we consider to use that source instead?

@senny whats your opinion on that?