QUnit Composite: Restructured to match other addons' folders.
QUnit Composite: Reduced API surface area.
QUnit Composite: Fixing some minor coding style inconsistencies.
QUnit Composite: Switched `for` loops to jQuery's preferred coding style.
QUnit Composite: Fixed bug with use of inline style instead of CSS class
that prevented the test results from ever being expanded.
QUnit Composite: Ensure the iframe is initialized once and only once per test run.
QUnit Composite: Removed a callback that showed which test was running since QUnit core already takes care of that.
QUnit Composite: Fixed the lifecycle logging callbacks such that they are only called when appropriate.
QUnit Composite: Improved the defensive coding techniques used while working with the iframe.
QUnit Composite: Updated the class name of the iframe and the title of the test page to use the 'Composite' name.