Revamp administration panel
Revamp administration panel

- Switch to ModelAdmin classes
- Use a single parent class for all StripeObject models
- Switch to StackedInlines instead of TabularInlines
- Set more readonly_fields, raw_id_fields etc.

jameshiew/dj-stripe,jleclanche/dj-stripe,tkwon/dj-stripe,dj-stripe/dj-stripe,dj-stripe/dj-stripe,pydanny/dj-stripe,pydanny/dj-stripe,jleclanche/dj-stripe,kavdev/dj-stripe,kavdev/dj-stripe,tkwon/dj-stripe,jameshiew/dj-stripe