Update to Elixir master
Depend on latest Elixir version
Remove deprecated (and now removed) Keyword.update/3, use Keyword.update! instead
Merge pull request #131 from jwarwick/keyword

Use Keyword.update!/3
remove websocket behavior from cowboy handler and add websocket example
simplify websocket example and add client example template
Merge pull request #134 from mathieul/websocket-info

Remove websocket behavior from cowboy handler and add websocket example