Can now swipe images

Will fix the following issues:
- No loading indicator
- No error handler
- No reload of higher resolution image for image full view
- Label in full view might not be displayed when swiping from landscape to portrait image. 

Will fix if feasible:
- Swiping is not animated
- Dismissing a picture from full view results in "jump" during the animation due to the aspect ratio. 
- Portrait images in grid few are squeezed