Ensure upload url's are URI.escaped
Ensure upload url's are URI.escaped

Fixes exception: https://www.getexceptional.com/exceptions/8519748

vveliev/teambox,teambox/teambox,irfanah/teambox,nfredrik/teambox,irfanah/teambox,nfredrik/teambox,vveliev/teambox,nfredrik/teambox,teambox/teambox,irfanah/teambox,vveliev/teambox,teambox/teambox,irfanah/teambox,vveliev/teambox,nfredrik/teambox,rahouldatta/teambox,rahouldatta/teambox,rahouldatta/teambox