fix interpolation of #{system} in test output
Merge pull request #111 from 3flex/fix-interpolation-in-test-output

fix interpolation of #{system} in test output
Convert the rspec-system tests over to beaker.

This converts over the spec tests to be beaker tests.  It adds tests for
all parameters that were untested previously.
Merge pull request #114 from apenney/beaker

Convert the rspec-system tests over to beaker.