Improve usability of test framework

[kriswest]

There are a number of refinements that should be made to the test framework to make it more usable:

1) Add a clear indication that tests are complete.

(superceded by #240)

Adding a 'done' message in the main view after all tests have run would:

• Ensure that its easy to determine when tests are complete
  • if errors occur in before or after hooks not all tests will run, leading to the progress % stopping at less than 100%
• Allow the test framework to be more easily installed in a CI system and the results extracted at the end of the run~

2) Add an easy way to re-run the tests.

Adding a restart or refresh button after all tests have run would make it easier to re-run tests without closing and reopening. This functionality is partially available in that clicking on a group heading in the tests will navigate the framework to grep URL (e.g. http://localhost:3001/v1.2/app/index.html?grep=fdc3%5C.getOrCreateChannel) that will allow you to run just that group. However, there is no way to navigate back to the beginning and re-run all tests.

3) Refine or replace the test selection menu to work with Mocha's built-in grep functionality.

If you click on group heading in the test report, the framework navigates to a grep URL (e.g. http://localhost:3001/v1.2/app/index.html?grep=fdc3%5C.getOrCreateChannel) which will run just that set of tests. However, the menu is not aware of this and will indicate that all tests are being re-run - when they will not be.

https://mochajs.org/#grep

The menu should be aware of the current filter (so it can select the appropriate entry from the menu) and should be able to override/change it. This may mean rebuilding that functionality using Mocha's own filtering support.