Refreshed branch from master.
Added tests. Made a folder for temp images, a model for creating label requests from a service dict and stubbed out endpoints.
Full label request, cycle, user -> service -> <-USPS, works for /usps_label_api. Returns JSON with a base 64 blob, for now. Starting browser interface. Will try and show label for download.
Browser app works for quotes and both APIs work. Going to leave many fields commented out of models in this branch.
Cleaned up some comments.