Treat Gravatar URLs as safe HTML
Treat Gravatar URLs as safe HTML

This fixes invalid rating and size parameters that lead to incorrect image
sizes (e.g. pixelated images) and unavailable PG-rated Gravatars.

Signed-off-by: Nick Quaranto <75ef9faee755c70589550b513ad881e5a603182c@quaran.to>

square/rubygems.org,rubygems/rubygems.org-backup,1337807/rubygems.org,dstrctrng/private_event,1337807/rubygems.org,bpm/getbpm.org,1337807/rubygems.org,rubygems/rubygems.org-backup,square/rubygems.org,rubygems/rubygems.org-backup,dstrctrng/private_event,square/rubygems.org,bpm/getbpm.org