Deprecate github.com/NYTimes/gziphandler

[Erich Kästner]

@skycoin-main as per Synths request:

We should replace the Deprecate NYTimes/gziphandler dependency with the following code snippet:

https://gist.github.com/CJEnright/bc2d8b8dc0c1389a9feeddb110f822d7

The code could be put into /src/util/http.