handle 308 redirection the same as 301 and 302
rename resume/resume_incomplete to permanent_redirect according to rfc7238

Use temporary_redirect intead of temporary_moved to make the words
line up nicely ;-)
Re-add resume to not break existing apps
as requested by Cory Benfield
Update index.rst
Merge pull request #2090 from ericfrederich/fix_308

handle 308 redirection the same as 301 and 302