Changed server implementation to use Agent instead of GenServer
Replaced deprecated Supervisor.Behaviour with Supervisor
Updated to elixir 0.14.0
Allow Elixir 0.15.0
Fix 0.15.0 bitstring modifiers deprectation warnings.
Merge branch 'master' of git://github.com/pma/flaky into pma-master

Conflicts:
	lib/flaky/server.ex
	mix.exs
Merge branch 'pma-master'