:bug: passing options to RuleCache() cause .cacheEvacuationInterval to always be undefined
:bug: passing options to RuleCache() cause .cacheEvacuationInterval to always be undefined

Some notes:

* .cacheEvacuationInterval is stored on options.permission.options.cacheEvacuationInterval
* doing setInterval(this._purge.bind(this), undefined) causes this._purge() to be called _extremely_ often instead of once per minute

deepstreamIO/deepstream.io,deepstreamIO/deepstream.io,hoxton-one/deepstream.io,deepstreamIO/deepstream.io,hoxton-one/deepstream.io