Roll

* **Breaking changes**:
* `options` extension is no more applied by default
([16](https://github.com/pyrates/roll/pull/16))
* deprecated `req` pytest fixture is now removed
([9](https://github.com/pyrates/roll/pull/9))
* Changed `Roll.hook` signature to also accept kwargs
([5](https://github.com/pyrates/roll/pull/5))
* `json` shorcut sets `utf-8` charset in `Content-Type` header
([13](https://github.com/pyrates/roll/pull/13))
* Added `static` extension to serve static files for development
([16](https://github.com/pyrates/roll/pull/16))
* `cors` accepts `headers` parameter to control `Access-Control-Allow-Headers`
([12](https://github.com/pyrates/roll/pull/12))
* Added `content_negociation` extension to reject unacceptable client requests
based on the `Accept` header
([21](https://github.com/pyrates/roll/pull/21))
* Allow to set multiple `Set-Cookie` headers
([23](https://github.com/pyrates/roll/pull/23))

* **Breaking change**:
order of parameters in events is always `request`, `response` and
optionnaly `error` if any, in that particular order.
* Add documentation.
* Move project to Github.

* **Breaking change**:
routes placeholder syntax changed from `:parameter` to `{parameter}`
* Switch routes from kua to autoroutes for performances.

* **Breaking change**:
`cors` extension parameter is no longer `value` but `origin`
* Improve benchmarks and overall performances.

* Resolve HTTP status only at response write time.

* Fix `setup.py`.