Vines request.rb will not work with the newest parser version

Since ff6d81a76df864a576fd5cf0e1540e588f3502bb vines uses
http_parser.rb version 0.6.0. But in the version request_path
and query_string method are gone.

related to diaspora/vines#24
Merge branch 'downgrade_http_parser' into develop

Conflicts:
	vines.gemspec
Updated Gemfile.lock