Assume UTC if no timzone spec'd in INTERNALDATE: Closes bgo#728647
Assume UTC if no timzone spec'd in INTERNALDATE: Closes bgo#728647

Netcourrier.com issues INTERNALDATEs with no timezone/UTC offset
specified.

robol/geary,AtticHacker/geary,jimbonator/geary,jimbonator/geary,martinra/geary,glebihan/geary,glebihan/geary,githubnemo/geary,tshikaboom/geary,AtticHacker/geary,martinra/geary,aatishnn/geary,AtticHacker/geary,tshikaboom/geary,rschroll/geary,rschroll/geary,emersion/geary,githubnemo/geary,mjog/geary,tshikaboom/geary,robol/geary,emersion/geary,mjog/geary,robol/geary,emersion/geary,aatishnn/geary,mjog/geary,glebihan/geary,MohamedIM/geary-unofficial,jimbonator/geary,martinra/geary,githubnemo/geary,geekvigilante/geary,aatishnn/geary