update webutil
extract profile picture for blogger
wordpress.com: return just name or username or blog domain from user_display_name()
failed attempt to fix a bug that only lets you log into G+ or Blogger, not both

once you've signed into one and have stored creds, my code (or oauth2client or both) fails to request new creds when you try to sign into the other. this adds approval_prompt=force and include_granted_scopes=true, but neither fix it.

looks like i'll have to use separate apps for now. :/
fix bug that prevented signing into both G+ and Blogger together

Adds wrapper classes around the StorageByKeyName and CredentialsModel model
classes to change their kinds so we can store separate creds for Google+ and
Blogger. Without this, after you've signed into one, signing into the other
tries to reuse the existing creds without re-requesting access for the new
product and scope, which obviously fails. I hoped approval_prompt=force or
include_granted_scopes=true or both would fix this, but no luck. :/