Recognizing @group

[atotic]

All core and paper elements specify @group pragma. I'd love to use it in my fancy-doc-viewer component to generate group hierarchy.

There is a problem. If @group pragma comes before @element, context-free-parser throws it away. This is a general problem, all pragmas before first @element are thrown away. And all Polymer code specifies @group before @element.

Suggested simple fixes:
a) Redo all polymer elements to put @group after @element
or
b) Keep track of dire encountered before first element, and insert them when element is created.