Preparation for pace statistics. Making app work again with Xcode 6 beta 6.
Improved pace calculation.
Created new project ATGraphKit and moved LineChart to it.
Prevents a crash that was caused by an activity with no trackpoints.

Fixed problem with background timer.
Added auto layout to table view. Improved speed graph by using average values.
Fixes for Xcode Beta 7

- updated submodule
- improved logging mechanism
Updated storyboard