SAMZA-2 and SAMZA-28

[Chris Riccomini]

Hey Guys,

Updated SAMZA-2 to model give MessageChooser the same lifecycle that everything 
else does (start, stop, and register).

Also looking for SAMZA-28 review.

    https://issues.apache.org/jira/browse/SAMZA-2
    https://issues.apache.org/jira/browse/SAMZA-28

Working on:

    https://issues.apache.org/jira/browse/SAMZA-25

Cheers,
Chris