chore(exampleApp): remove reference to harmony-reflect

Since we have decided to not use the Proxy dependent
strategy that is not yet fully supported by browsers, remove
the harmony-reflect scripts.
test(domDecorator): remove unnecessary override of $timeout mock:

Now that the controller decoration is accomplished
without the zone.js library, the mock implementation
of $timeout is sufficient to perform the asynchronous tests.
Hence they are refactored to be in the same testing file, and
unnecessary tests are removed.

Relates to #1 in angular-hint-dom