GA Find app integration feature - Userdata from WMS url

To support integration with the Find app, I've added a small feature that simply looks at a different hash path (similar to start for sharing) that expects a WMS GetCapabilities URL.

This will allow simple integration with the [Find](http://find.ga.gov.au/) application at GA.
Also address requirement requested by issue #435 .

Currently uses `remoteWMS` as the location of the WMS url and is still limited by the supported cors and proxy domains.

I had a look through current work but couldn't find this currently being worked on, if this is already planned to be done another way, let me know. Any feedback or required changes would be appreciated.

Cheers!