First attempt at PUDL data package infrastructure
First attempt at PUDL data package infrastructure

A module with routines for extracting metadata from the PUDL database
for use constructing portable [Tabular Data Packages](http://frictionlessdata.io/specs/tabular-data-package/) as specified by the folks at Frictionless Data.

Right now the module can generate Table Schemas and Tabular Data
Resources, but it doesn't do any data file extraction or management, and
it doesn't integrate any table or data source specific metadata which
isn't accessible from within the database itself.  We'll need to create
a separate collection of that information somewhere. Honestly maybe it
should be put in the database too.

Progress toward #211

catalyst-cooperative/pudl,catalyst-cooperative/pudl