Inchoate deflate and gzip support for org.openhab.io.net.http.HTTPUtils.

Solves a problem with some shabby http servers that do not care about the "Accepted-Encodings" header and simply send gzip. It could be developed futher to tell the server about the accepted encoding.
Merge pull request #1146 from the78mole/master

Inchoate deflate and gzip support for org.openhab.io.net.http.HTTPUtils.