setup YAPDatabase views and mappings for date taken last first, date uploaded last first
disable other view controllers temporarily. fix position after rotating.
Fix layout and connection
fix rotation collection view
refactor yap data source
refactor view and mappings generator
flatten view mapping
push horizontal
refactor photos horizontal
fix multiple setup calling
fix horizontal scrolling
transition from grouped to horizontal
custom back navigation button
put navigation button in block
zoom in out transition
fix animation of navigation bar when transitioning from grouped to flattened
fix dismiss transition
fix dismiss transition
fix dismiss transition
restore navigation bar toggling on scrolling horizontal