Add a 'distribution' module to create assemblies

o Moves the maven-assembly-plugin from adam-cli to the
  new distribution module
o Updates the adam-submit and friends to work from source
  or binary distributions
o Generates docs and adds them to the distribution
o Adds LICENSE, NOTICE.txt, CHANGES.md, etc to distribution
Merge pull request #509 from massie/distro

Add a 'distribution' module to create assemblies