Create interface for QUnit tests

Instead of using `http://admin.grasshopper.com/tests/qunit/tests/api.html`, we should have something like `http://admin.grasshopper.com/tests` which gives us an overview of all the unit tests.

To do:
- [ ] Update Apache configuration files
- [ ] Create index.html file with a reference to all the unit tests
- [ ] Update the Grunt file