implemented the framework message callback
implemented the framework message callback

mdevilliers/erlang-mesos,mokele/erlang-mesos,basho-labs/erlang-mesos,mdevilliers/erlang-mesos,basho-labs/erlang-mesos,basho-labs/mesos-executor-bindings,mokele/erlang-mesos,basho-labs/mesos-executor-bindings