Updated getUrl() usage to conduit 0.8.0

- getUrl() now always returns a string; must either be passed to `parse_url()` or
  cast to a `Phly\Http\Uri` instance.
s/setStatusCode/setStatus/

- due to changes in psr/http-message and phly/http
Fixed originalUrl usage

- In cases where it was being used as a `Phly\Http\Uri` instance,
  updated to use either `parse_url` or cast it to a `Uri`.
Updated body parameter logic

- Push into req->body property
- Pull from req->body property
- Updated to conduit 0.8.1 to ensure that properties are synced with attributes
Updated composer.phar
Merge branch 'feature/update-conduit-0.8.0'

Updates to conduit 0.8.1