Add link to github issue tracker.
Parse and include split entries when importing activities. This is
neceaasey first step for issue #1
Submit distance and heart_rate splits to RunKeeper when posting a new
activity.  Sadly, RunKeeper does not support arbitrary distance splits,
so only the heart rate will show up on the RunKeeper site.

Hopefully they will address this deficiency in the API in a future
release.  This is the closest I can come to resolving issue #1 for now.
Remove a TODO item which has been completed.
Try to be resiliant for logs that lack heartrate or split distances.
Add splits column to activities table to support issue #1
Standard Rivet traceback handler to log site errors to database.