autogen: Rename 'protein-db' to 'pip-db'

Issue #173.
tools/README: Rename 'protein-db' to 'pip-db'

Issue #173.
www/html/demo.html: Rename 'protein-db' to 'pip-db'

Issue #173.
tools/pipbot.js: Rename 'protein-db' to 'pip-db'

Issue #173.