Merge branch 'hotfix/http-message-0.3.0'

Updates to:

- psr/http-message 0.3.0
- phly/http 0.5.0
- phly/conduit 0.6.1

This entailed:

- Removing the `QueryParams` middleware (`IncomingRequestInterface` covers this),
  and modifying any middleware that consumes query parameters to pull them from
  `$request->getQueryParams()` instead. (Middleware affected included
  `Mwop\Auth\Auth`, `Mwop\Auth\AuthCallback`, `Mwop\Blog\EngineMiddleware`,
  and `Mwop\Redirects`.)
- Updating `public/index.php`:
  - to ensure that all superglobals are provided when creating the server;
  - to remove the QueryParams middleware from the pipeline.
- Updating `BodyParams` to:
  - do nothing for `x-www-form-urlencoded`
  - inject deserialized JSON via `$request->setBodyParams()`
- Updated `Mwop\Contact\Process` to pull body parameters using
  `$request->getBodyParams()`.
- Updated `Mwop\Templated` to typehint on `IncomingRequestInterface`.
Fixed typo in BodyParams
Merge branch 'hotfix/body-params' into develop