* Clean up base modules
* Clean up forms modules
* Clean up templatetags modules
* Replace custom simplify_decimal filter with floatformat
* Misc cleanup
* Merge ReturnURLForm into ConfirmationForm
* Clean up import statements for utilities.forms
* Fix field class references in docs
* Move ASN to a separate module
* Move ASNField from dcim to ipam
* Introduce ASNRange model
* Add relationship from ASN to ASNRange
* Add an available-asns API endpoint
* Add RIR assignment for ASNRange
* Add standard tests
* Move child ASNs to a tabbed view
* Remove FK on ASN to ASNRange
* Add tests for provisioning available ASNs
* Add docs for ASNRange