Add better queries for manufacture/delivery of drugs

These queries are based on looking through the charge descriptions
and statutes of many records and building queries that take both
into account.

Factor drug queries out into a  separate module.

Use Sphinx to create the skeleton of some docs.

Addresses #9
Tweak manufacture and delivery drug charge queries

Fix some typos, mostly

Addresses #9
Reorder class X queries

Move class X queries to the top so the queries follow the
alphanumeric ordering in the ILCS.

Remove trailing whitespace.

Addresses #9
Add queries for drug possession

Addresses #9
Add changes to IPython notebook

Add drug-related inquiries.

Addresses #9