NO-JIRA-failing-myfinaid-travis-test

This is a revision of a MyFinAid test that was failing on Travis
https://travis-ci.org/ets-berkeley-edu/calcentral/jobs/17799842

The failing assumption was removed because
1. It wasn't really testing the myfinaid model, but rather the output
   of DatedFeed's format_date method, and
2. It failed because the Travis server's configured timezone can be,
   and is, different than the CalCentral server's configuration

The test's previous assumption
  DateTime.parse(a_dated_entry[:date][:date_time]).zone.should_not == '+00:00'
that the server's time zone configuration should not be GMT is enough to
test this scenario for now.