[WIP] Setup an API Explorer test page

Review Request #8660 — Created Jan. 22, 2017 and discarded — Latest diff uploaded


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Currently, we download the resource when accessing the API from the browser.
We want to have a UI on top of the webAPI when accessing it in the browser.

I added a test url at localhost:8080/apiexplorer, connected it to a view which renders
to a new, empty template (apiexplorer.html). Currently, the template only has RB's
header bar (base.html) and a title.

I ran the dev-server and opened localhost:8080/apiexplorer to see the empty template with
the RB header / toolbar as well as the title "API Explorer"