Merge pull request #404 from learning-unlimited/django-1.4-support

Django 1.4 support
Added check availability module.
Changed from list to set for a bit higher efficiency.
Integrated check availability module into availability module, deleted check availability module.
Removes devserver-specific settings files
Removes custom DB schema change code

This should be unnecessary now, since we use South. If that is not
the case, revert this commit.
Removes devserver specific Python conf
Removes old, unused FastCGI scripts
Removes SVN configuration
Removes old install script
Removes old, unused lighttpd configurations
Removes Gentoo mime types conf
Removes RT configuration
Removes devserver virtual host configs
Removes deprecated get list of students scripts
Removes unuseful script
Removes selenium test for old lottery interface
Removes unuseful script
Removes unuseful script
Removes an old install script