CE/dashboard

* created odometer class to track run stats
* created time interval formatter as there appears to be a bug in the standard formatter
* created distance formatter to avoid displaying "feet" for short distances and to allow the option of not showing units appended to the end of the string
* created pace formatter with optional units displayed 
* connected run stats to dashboard using new formatters
* connected progress bar
* updated default values in storyboard
On further thought, I'm not sure you need a `currentLocation` property at all.