Challenge completed 80% + Add new features

- Remove Main storyboard to complete the challenge programmatically
- Add table view and custom table view cell with : tags and timestamp
labels + image view (with proportional hight) + caption textview +
title label (when no photos and caption in DB)
- Custom background image of the navigation bar (TODO: Fix the
resolution of the image landscape mode for 4 inch and 3.5 inch)
- Add resort right button in navigation bar

TODO :
- Add Post button in navigation bar
- Unit Test
- Fix set height of caption