Stagecraft client

We currently serve up a 501 for the service dashboards page.

This is because the response from stagecraft doesn't return a page-type so we end up service not implemented.

To get round this we can use the path. If we're not using a path we can assume we're hitting /dashboards and serve up a 200.

Tests for this has been added also.
We'll still get a 501 from the `/performance/services` page though won't we?