tests/test_Populate.py: assume os=RHEL if not specified
system.py: add refresh_subscriptions and systems_by_org api calls
test_HealAll introduced (refreshing all systems subscriptions in org)
Merge pull request #13 from vittyvk/master

New test_HealAll test, assume os=RHEL in test_Populate
provide system.certificate_version=3.2 fact to mitigate "Too many content sets for certificate ..." candlepin issue
Updated instructions on how to also use either unittest or nosetests via the command line to run tests.
Renamed environment variables so not to conflict with default environment variables.
Merge pull request #14 from vittyvk/master

provide system.certificate_version=3.2 fact to mitigate "Too many content sets for certificate ..." candlepin issue
Modified all existing classes to subsclass their corresponding Katello counterparts, overriding some of the methods for convenience. Updated most of the core tests.
Merge branch 'master' of github.com:omaciel/mangonel
Initial code to support testing users.