Lots of clean up on the messaging notification sample to show the real correct way to do things. Also mark up a bunch of the sample for use in the documentation. Change-Id: I3a29a944c2971e142c33b29aff94b1ba0b40ae0e
Adding a new folder in development/samples is not enough to have it be packaged with the SDK. Make sure to edit development/build/sdk.atree to add the sample to the SDK build.