* initial commit of URL support for launch
* lint
* modify tests to use new data locator
* add locator unit tests
* fix typo in faq
* more lint
* update faq per PR review
* move app creation to function
* create engine without load
* flake 8 fixes
* cleanup original scanpy test
* add default config
* handle missing data
* test data changes
* unify update
* load data isn't static anymore
* make app a class