* small fixes to build instructions and links
- added sample_id as constraint in sample query
so it's not misread as an int field
- intro link should fix#31
The context link to an open bug gives the reader some recourse if they
need documentation that does not yet exist. Hopefully this helps with
prioritization.
Github.com uses the top level README.md for the main description of this
repository. This change configures GitBook to use ./introduction.md as
the book README and provides a more helpful README.md for readers
visiting the Github repository.