tree 22f605e3c44fe106819126b15c90bad97ca30832
parent ff57ea1071997c7fe0f4d55e31ea603fd30122c6
author martin f. krafft <madduck@madduck.net> 1373318003 +0200
committer martin f. krafft <madduck@madduck.net> 1374174860 +0200

Reimplement Classes as simplified (not-fully-functional) ordered set

Classes is essentially an ordered set, but we only need very limited
functionality, so keep it simple and provide only the very basics.

Purposely, Classes no longer derives from list so as to not give a false
impression.

Also, switch from nose to unittest.

Signed-off-by: martin f. krafft <madduck@madduck.net>