[Bug 741604] fix dict comprehension syntax in migration for python 2.6
[fix bug 937104] Update to latest playdoh.

This commit also removes django-browserid from vendor-local since
playdoh is now up-to-date.
Specify python 2.6 in install docs
Merge pull request #721 from hoosteeno/docs

Specify python 2.6 in install docs
Merge pull request #717 from glogiotatidis/playdoh-upgrade

[fix bug 937104] Update to latest playdoh.
Bug 916819 -  Change UserProfile.__getattribute__ to not depend on privacy_fields