Custom Elements Manifest and the OWC analyzer app

[sidewayss]

Regarding your PR #83: I recently used the same analyzer app, though I am not using JSDoc. It has some funky behavior around private properties, but you don't seem to be using those. It's also requires bundling all the javascript modules before before analysis because it doesn't process inherited properties from imported superclasses. On the positive side, in spite of there being no examples I could find, it does process multiple elements in a single, bundled file.

How you are testing the custom-elements.json? Do you have it working with Intellisense in your editor? What other ways do you foresee people using the manifest and how do you foresee testing them?