Temporarily downgraded requests until they fix a bug.
Trying to avoid updated requests on the script itself.
Narrowing specfication again to avoid a second update of request at bokeh install time.
It seems we need to avoid requests upgrate in testing requirements too... grrrr.
Tried to pin requests.
Forgot to save... one of these mornings...
Merge pull request #1101 from ContinuumIO/hotfix/requests_downgrade

Temporarily downgraded requests until they fix a bug.