Wrapper for Strava API

[sladkovm]

Universal wrapper function to do:

1. Low-level fetch latest Activities and Streams and add them into collections
   • implement listStravaActivities function with before and after argument
   • implement recursive fetching of the activities using the before argument - default return is 30 activities
   • implement fetching of the latest activities using the after argument. To get the data of the latest activity - db.activities.find().sort({start_date: -1})[0].start_date
   • call on startup
   • provide button to fetch new
2. Create client-side methods (./imports/api/*) for calling low-level functions on the collections
3. Implement On-client startup - fetching the latest activities and streams
4. Implement On-change route - fetching the latest activities and streams

[sladkovm]

Implement data filtering on the server using Meteor.publish() methods and call them via Metheor.call() from the client. Subscribe to the results at the client.