Merge branch 'hotfix/181'

Close #181
Fixes #163
Grab data from parameter container

- If the parameter container is a ZF\ContentNegotiation\ParameterDataContainer
  instance, pull the body parameters from it before attempting to use it as an
  array.
Merge branch 'hotfix/filter-listener-data-container' into develop

Fixes an issue with the CryptFilterListener, and how it was pulling data from
the discovered content negotiation parameter data.