add expire field to interfaces
add expire_interfaces command
rename expire_interfaces to expire_objects
make expire field optional
add expire field to forms
Set up functionality to set a default ctnr
use proper deletion for expired objects
show a better input format
Merge branch 'master' of https://github.com/OSU-Net/cyder into default_ctnr
change last_seen to datetime field
remove old last_seen logic
migrate last_seen as datetime
fix tuple syntax
use get_models instead of model list
Added button to set default ctnr
suppress mysqldb warnings for last_seen migrations
Merge branch 'master' into expirable

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

Except for core/ stuff. Oops.
Unify klasses