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
allow quotation marks in txt records
Fix log fuction arguments; increase severity
Merge pull request #545 from drkitty/logging-argument-fix

Fix log fuction arguments; increase severity
remove unnecessary settings, where did they even come from
Merge pull request #540 from murrown/txt_allow_quotes

Allow quotation marks in TXT records, all tests pass. Can confirm allows quotes in data.
Merge pull request #503 from murrown/expirable

Expirable
Added csrf token to empty list object creation form
Add south migration for expirable objects, pull request #503
Merge pull request #553 from church29/Empty_List_CSRF

Added csrf token to empty list object creation form