Update site-maven-plugin version

Partial resolution of: https://www.pivotaltracker.com/story/show/82427854
Improve error message for cases of invalid or missing namespaces.

Resolves: https://www.pivotaltracker.com/story/show/82412616
Remove pointless double-lock and improve module branch coverage
Add tests in kernel-impl
Add test for build message exception
Remove unused method.
Add result transform tests
Remove stale helper method and dysfunctional test