A couple of extra query methods to perform simple time based queries, observer queries for watching for background updates
and a statistic query that is useful for working out the number of steps in a day. (In particular useful when you have
multiple data sources)

A minor fix to requestAuthorization to make sure that callback is still avaliable if it is used to notify the user of an error
Update HealthKit.js

Accidentally using the plugins directory version
Merge pull request #9 from kingsfleet/master

Add a few more generic queries.