Early commit for review

[rosemwahlin]

An early commit for feedback before I go down the wrong path. :)

An early code review to keep me from going too far down the wrong track.

Some background:

The user will be told in the hands-on to run codegen to get project files/type files to work with this application. (I'll be adding the Subscriber side next when this code looks reasonable). The user will be told in the hands-on to edit the Topic names, and the data being written I know the Application is under-commented, but hopefully the intent is clear.

I'll be working on the Subscriber side next, and moving from Listeners to using a WaitSet.

Also: Should we have javadoc comments before each class and method?