Karaage

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* Fix issue of not being able to search from page 2+ in userlist, Fixes 40
* Fixed 44 </tr> tag now in correct place for valid html
* Fixed bug in get_available_time and created a test to make sure it's correct
* Allow PID to be specified in admin project form
* More testing

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* Decreased verbosity in management scripts
* Split user forms up one with username/password, one without
* Don't update datastore when saving a user in create script
* Only require required attributes in create_new_user method
* Moved to using django-simple-captcha instead of custom one
* Changed ordering when updating users in ldap datastore. Fixes 41
* More unit tests

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* Gecos and gidNumber are now also configurable via ldap_attrs

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* Pull in django-south dependency

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* Use active institutes in forms

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* Use Django-south for DB migrations
* Added is_active field to Institute