prevent unexpected file deletion

"FILE_TTL" value is passed to a "pyrax/cf_wrapper/client.py/CFClient.store_object()" method, which sets "X-Delete-After" header for non-None values.
Merge pull request #159 from baffolobill/patch-1

prevent unexpected file deletion
add Daniel Izquierdo to authors
fix auth url as per: https://github.com/rackspace/pyrax/issues/414
Merge pull request #165 from rizumu/fix-rackspace-authentication

fix auth url
require newer version of pyrax

There are critical upstream bugfixes that are in pyrax 1.9
Most importantly, celery processes are long-lived days on end, but pyrax
auth was timing out at 24 hours, causing auth issues.
Merge pull request #166 from rizumu/upgrade-pyrax

require newer version of pyrax
greater than OR equal to 1.9
Merge pull request #167 from rizumu/upgrade-pyrax

greater than OR equal to 1.9
default to v2
s/conn/_connection/ (as in storage.py)
refactor authentication to one file, additionally using more of pyrax
flake8
Revert "greater than OR equal to 1.9"

This reverts commit 830d9c10112453121e4e454462c690b3ad950215.
Revert "require newer version of pyrax"

This reverts commit 5496771bebe6768c57bc2ec5168c4557589ca1e8.
Revert "fix auth url as per: https://github.com/rackspace/pyrax/issues/414"

This reverts commit b7d503f32e4b11622c1000815f901141fdabaefd.
Merge branch 'master' into pyrax-refactor
Revert "Revert "fix auth url as per: https://github.com/rackspace/pyrax/issues/414""

This reverts commit 31973aa3865123a38fad6647d131d493b73ebbf4.
Revert "Revert "require newer version of pyrax""

This reverts commit 3abb94d7dea7fd871500dd0419892b664899469d.
Revert "Revert "greater than OR equal to 1.9""

This reverts commit 7e2ac4c4b96d53bb682a7530d914936b17765d0b.