* Problem: Source files contain no license info
Solution: Add comments with SPDX license info to source files
* Python 3 files don't need # -*- coding: utf-8 -*-
* Problem: we don't have any tests for malicious strings
Solution: Use a parameterized test that fuzzes over a library of potentially hazardous strings
* Needed to update the Dockerfile to install blns
* Removed unnecessary import from Dockerfile-dev
* Made the conditions under which the test expects an error more explicit
* Improved reporting in case of a bad status code
* Removed some over-zealous assertions.
* Removed `sent_transaction` from assertation error response
* *Problem: blns was removed as a dependency while fixing a merge conflict
Solution: added it back to the Dockerfile
* *Problem: made a typo when adding blns to the Dockerfile
Solution: fixed the typo
