following 302 redirects on taskqueue routes (which happen if you post to http on a https task)
following only up to 5 302 redirects instead
Merge branch 'fix-keys-only-queries' into follow-redirects-on-tasks
added better logging when tasks retry
Merge remote-tracking branch 'org/testing' into follow-redirects-on-tasks
extracted code to calculate exponential backoff to shared method
Merge pull request #689 from shatterednirvana/follow-redirects-on-tasks

following 302 redirects on taskqueue routes