Spring updates

Second version of watch application released. It has minor enhancements:
- runtime location permissions request added to avoid manual location permission setting for the first start
- some images are changed
- distribution package built with the latest library release code

In a short time mobile application will be published as well. The changes it has are more valuable:
- tracks list added, ability see collected tracks in application
- track map added, ability to see the track on a google map and to navigate to any of the track point
- runtime location permissions request added
- background textures changed to comply with the old devices
- authentication policy changed: no e-mail confirmation required watching tracks in mobile app