add expire field to interfaces
add expire_interfaces command
rename expire_interfaces to expire_objects
make expire field optional
add expire field to forms
use proper deletion for expired objects
show a better input format
use get_models instead of model list
Merge branch 'master' into expirable

Conflicts:
	cyder/settings/base.py
Add pretty_type
Remove FQDNFormKlass stuff

Except for core/ stuff. Oops.
Unify klasses
Add pretty_obj_type to context
Fix a ton of stuff
Fix some create_button calls
Unify title logic
Make update forms more consistent
Don't auto-capitalize site names
Fix some pretty_names
Remove unused templates and views