merge revision(s) 39232,39233,39238: [Backport #7831][Backport #7852]

	* lib/net/http:  Do not handle Content-Encoding when the user sets
	  Accept-Encoding.  This allows users to handle Content-Encoding for
	  themselves.  This restores backwards-compatibility with Ruby 1.x.

	* lib/net/http/generic_request.rb:  ditto.

	* lib/net/http/response.rb:  ditto

	* test/net/http/test_http.rb:  Test for the above.

	* test/net/http/test_http_request.rb:  ditto.

	* test/net/http/test_httpresponse.rb:  ditto.
	  [ruby-trunk - Bug #7831]

	* lib/net/http.rb:  Removed OpenSSL dependency from Net::HTTP.

	* test/net/http/test_http.rb:  Remove Zlib dependency from tests.

	* test/net/http/test_http_request.rb:  ditto.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@39244 b2dd03c8-39d4-4d8f-98ff-823fe69b080e