- working towards integrating ideas and suggestions from @kjona
- restructure for:
  - easier usage patterns
  - translating error status messages into exceptions
  - assertions about returned data
- todos are:
  - some remaining methods from PR #2
  - further methods to allow full control of test context
  - full (as possible) coverage of use cases and api capabilities
  - maybe even some convenience methods.

- move requirements to separate text file
- read version from __version__ in package init file
- move test to top-level folder, update names so unittest can find them
- corresponding .idea updates + change venv to py 3.5 from 3.4