Split http headers by a comma and a whitespace -- net::http and other faraday adapters 'helpfully' combine same-name headers
link headers are plain strings, not rdf::uris
Also run travis on 2.1 and jruby
update readme.md

It's not obvious how to use this gem without rummaging through the specs.
Merge pull request #3 from bmaddy/patch-1

update readme.md
added and fixed some tests, made it raise an exception on failed updates
expose last_response so we can see if a save succeeded or not
Merge pull request #4 from cbeer/fix_save_bang

added and fixed some tests, made it raise an exception on failed updates