make get_latest_version a get_version instance method
date_create should be a DateTimeField because how would we get the latest thing if a bunch of them were created on the same day?
more explicit imports, organize imports in accounting.models
get_rate for a Feature
custom FeatureRate equality
added FeatureRateForm
clean up imports in accounting views
add BaseAsyncHandler for handling async post requests in a view
cleanup some things in EditSoftwarePlanView
add asymc handlers for accounting software plan view
knockout models for softwareplanversion form
add software plan version form and integrate with handlers
migration for changing date_created’s DateField into DateTimeField
show errors for hidden inline fields
cleanup some comments and things in software plan version form
return text too in the select2 response
Merge pull request #2358 from dimagi/accounting-f1-ko

Knockout for managing FeatureRates in SoftwarePlanVersion form