Added upload progress tracking to AccountManager via JSON
Put ModelUploder on a different thread, not to block the rendering of the main window
Added feedback and a better success check
Fixed double JSON callback when http error occurs
Removed all the temporaryDir junk
Code review
Merge branch 'master' of https://github.com/highfidelity/hifi into more_upload_work
Merge pull request #2613 from Atlante45/more_upload_work

More upload work