Completion for namespaces+classes inside goog.require( )

[angelozerr]

It should be cool if tern closure provides completion for namespaces+classes inside goog.require( )

tern provides hook for completion. I have done a PR for node module completion in ternjs/tern#348

It should be cool if you can study it and do the same thing for closure and improve too my PR.

[jgiles]

We should be able to do this, at least for names that we already know about for other reasons.

Further down the line, we could look at populating the global namespace with all the names a file finder encounters, but we would want to keep that behind an option to avoid crowding the global namespace in large projects.