stub empty persisted and vendor schema extensions

Introduce some empty files as placeholders.
parseable vendor schemas, still blank

Make the new schemas parseable, at least.
Also record the fact that cbg, carbs, smbg, and messages should
already match.
add combo bolus, the weirdest record
allow validator to intelligently detect bolus type

Allow any of the valid types.
Include schemas directory in package.json
Make Medtronic extensions usable
Release notes for v0.0.5
0.0.5
Add test for medtronic extension
Merge pull request #13 from tidepool-org/bewest/medtronic-extensions

Bewest/medtronic extensions