Kernal.is_regex appears to be deprecated, going by some irc discussion http://irclogger.com/.elixir-lang/2014-03-01
it looks like Kernal.is_record/2 can be used as a replacement in a guard
Plug.Connection is now Plug.Conn
Merge pull request #178 from adamkittelson/master

Some updates for Elixir 0.13.0