Added showing/hiding of buyer/owner fields for filling out event pass info.
Disabled 'hosting' option for other owners.
Documented and implemented logic behind registration form types.
Tied guest/host forms to particular personitems. Added max_per_owner constraint support.
Constraint support ties into issue #20.
Corrected itemoption formset display.
Made "nights" field required on housing fields.
Resolves #31.
Added confirmation support to ef fields on host/guest forms and housing categories on host forms.
Resolves #30. Resolves #32.
Added explicit contenttypes dependency for migration 0002.
Workaround for django bug #22518.
https://code.djangoproject.com/ticket/22518