Added support for posting Nike+ running info to Pebble's Sports App using PebbleKit APIs

Added PebbleKit source and updated other files to post Nike+ running info into Pebble's own Sports watch app. For this, I had to modify formatting of time to exclude letters like h/m/s as Pebble's Sports app is unable to display such letters. Also added workaround for pace calculation instead of fetching from Nike+ activity.