Make #verify_uniform_ownership non-destructive
Incorporate #verify_uniform_ownership into task multiple-update route
Remove unused step definition
Add non-destructive ::sanitize_attributes method
include GeneralHelperMethods to use #sanitize_attributes
Expect sanitized hash instead of full hash
Refactor task mass-update route
Make ::set_attributes return model, for ease of chaining
Refactor multiple task update route
Delete refactored-out ::set_attributes method
Update ReactiveSupport
Update Rake