Fixes #77. Tests were failing for non-UTC timezones as the cached DateFormat was using a SimpleDateFormat with the default JVM timezone and the tests were enforcing UTC timezone. As Cougar officially only supports UTC we can/should make sure the SimpleDateFormat is using UTC timezone.
Merge pull request #78 from andredasilvapinto/fixtests

Fixes #77. Tests were failing for non-UTC timezones as the cached DateFo...