Log Message:
Changes 1.5.5:
Django 1.5.5 fixes a couple security-related bugs and several other bugs in the \ 
1.5 series.

Readdressed denial-of-service via password hashers
Django 1.5.4 imposes a 4096-byte limit on passwords in order to mitigate a \ 
denial-of-service attack through submission of bogus but extremely large \ 
passwords. In Django 1.5.5, we’ve reverted this change and instead improved \ 
the speed of our PBKDF2 algorithm by not rehashing the key on every iteration.

Properly rotate CSRF token on login
This behaviour introduced as a security hardening measure in Django 1.5.2 did \ 
not work properly and is now fixed.

Bugfixes
Fixed a data corruption bug with datetime_safe.datetime.combine.
Fixed a Python 3 incompatability in django.utils.text.unescape_entities().
Fixed a couple data corruption issues with QuerySet edge cases under Oracle and \ 
MySQL.
Fixed crashes when using combinations of annotate(), select_related(), and only()