Added new parameters to the script
Stylish cleanups.
Correct failing unit tests and add convenience method.
Adding unit tests for new migration script options.
Adding autocomplete stuff for new migration script options.
Merge remote branch 'origin/master' into alikins/redhataccount
Refactor credentials gathering.

Additionally, use a more generic term that "System Engine".
Merge pull request #765 from candlepin/alikins/redhataccount

Alikins/redhataccount