Tests and a basic profile for reduced AT deps

There were no tests that triggered on our problems.
Also, plone.app.testing tests.
The tests are veery basic but a start.

The package now contains a profile. The profile will install everything
that once came from Archetypes. It utilizes Archetype code and classes
but does not need to run any AT Profile.
Merge pull request #2 from plone/do3cc_reduced_at_dep_and_tests

Tests and a basic profile for reduced AT deps