Add new pipeline for basic codebase scan

[pombredanne]

The input to that pipeline would be code archive(s).
The pipeline would:

1. extract the archives (not recursively at first)
2. run the equivalent of scancode -clipeu scan on that code
3. create one or more inventory analysis "workfile" report as CSV, JSON (or XLS TBD) listing all the captured resources and packages in a format TBD.

The reports would be created by the pipeline and stored on disk to be retrieved by the API