Initial start on rspec-system tests

This patch includes system tests using rspec-system. You can try these out
with:

    rake spec:system

Consult the docs in the README.md for details on how to run tests on
different OS variants.

Signed-off-by: Ken Barber <ken@bob.sh>
Merge branch 'rspec-system'

* rspec-system:
  Initial start on rspec-system tests