Relay prototype

Considering getting this simple relay implementation into ThaliProject while I finish up the other aspects of it - to simplify folks using the HTML5 seed.   Perhaps into a new branch on ThaliProject - but then you wouldn't be able to see the diff for review.

Only one source file here for the relay - RelayWebServer.java (and RelayWebServerTest.java).  The other bits are all NanoHTTPD.  Open questions on code file headers for those....
Hmm, actually, it may be worse - I think InputStreamEntity is expecting the raw request from the beginning - I suspect you'd use it to write your own HTTP server - In this case I'd have to buffer that stream (NanoHTTPD doesn't hold onto the bits that are already parsed), load it, then modify the apache request to pull out all the bits that shouldn't have made it there (certain headers, etc).   Going to leave it using the NanoHTTPD parse body for now and revisit once everything else works :(