Initial run on data provenance
De-folksify the doc a little bit and clarify a few things.
Update DataProvenance.md
Merge pull request #23 from tidepool-org/cheddar/provenance

Initial run on data provenance
Initial write up of failure scenarios for the Tidepool platform
Edits
Merge pull request #24 from tidepool-org/cheddar/data-loss

Initial write up of failure scenarios for the Tidepool platform
Merge branch 'master' of github.com:tidepool-org/tidepool-org.github.io into kjq/notes
Clarify source and deviceId
Respond to more feedback