stop logging 404s as errors (#93)

Creating hotfix tag for removing stacktraces from production

environments

Make actions first class citizens (#75)

According to the [intent of ADR][1], the Action part of the triad is
meant to be a completely custom class that provides a boundary between
HTTP and domain logic. The action is aware of the domain and knows how
to direct output through a responder.

This is not how Equip has been treating the domain. Our attempts to
make Domain pseudo-HTTP-aware with Payload and Input has not been very
successful and is probably the least concise bit of the framework.

[1]: http://pmjones.io/adr/

Also includes changes from:

* Remove payload from formatting (#77)
* Restore content negotiation (#78)
* Add documentation for v3 changes (#79)
* Remove payload and input classes (#80)
* Remove content negotiation (#84)

Add docs for route prefixing

Also update the changelog.

Refs #69

Update changelog for 2.0.1 release

Add release date for 2.0

Move exception logging further up in execution (#30)

Whoops's handleException method was halting execution, which meant
that the logging method was never reached.

Add 1.8.0 release to CHANGELOG (#29)

Merge pull request #26 from equip/feature/plates-configuration

Add PlatesConfiguration

Correct release date for 1.6.0