[1.5.x] Post release version bump.
[1.5.x] Added dates to release notes of today's release.

Backport of 68d264059abb21b96c4fe68bf4d99520268a451c from master
[1.5.x] Fixed #22575 -- Fixed typo in docs/topics/class-based-views/generic-editing.txt.

Thanks adminq80 at gmail.com.

Backport of 87776859af from master
[1.5.x] Dropped fix_IE_for_vary/attach.

This is a security fix. Disclosure following shortly.
[1.5.x] Added additional checks in is_safe_url to account for flexible parsing.

This is a security fix. Disclosure following shortly.
Added release notes for 1.4.13, 1.5.8.
Bumped version numbers for release.
Merge tag '1.5.8' into nonrel-1.5

Django 1.5.8