Bug 5244 - whitelist google docs for embedding

Allow Google documents, presentations, and spreadsheets to be embedded.
Drawings do not need to be whitelisted, as they are images. Google forms
are not being whitelisted for security concerns at this time.
Merge branch 'stormerider-bug-5244' into develop

* stormerider-bug-5244:
  Bug 5244 - whitelist google docs for embedding

Conflicts:
	t/embed-whitelist.t