Update py-flask-login to 0.3.2.

Version 0.3.2
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Released on October 8th, 2015

- Fixes Python 2.6 compatibility.
- Updates SESSION_KEYS to include "remember".

Version 0.3.1
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Released on September 30th, 2015

- Fixes removal of non-Flask-Login keys from session object when using
  'strong' protection.

(kleink)