Update to QUnit 1.12.0.

This also replaces the originally runner script with the current version
recommended by the QUnit project.

The new runner fixes the issue with ember-data causing the moduleDone
output (totals for test count, time, errors, failures) to be printed
once for each test (instead of only once per module).
Merge pull request #62 from rjackson/update_qunit_version

Update to QUnit 1.12.0.