Allow setting of accepted content encodings and charset

[erickok]

Although the defaults make a lot of sense, sometimes a server doesn't play nice and you need to set a specific content encoding and character set to be accepted. For example, teh webserver I am talking to claims to support gzipped content, but often returns scrambled data when I ask for it.

I suggest keeping the defaults in place but allow setting of content encodings and charset on the HttpClient, so these settings are used in any successive http request.