use nsvaluetranformers to parse data
add albums relationship to photo
photo managed object serialization
update models to be coredataable.
test tag
Use overcoat as client
add managed object serialisation in request operation.
save response objects to core data
got the core data + mantle + json working.
cache the serialised mtlmodel from managed object
fix pagination and add pageSize param
photos
remove the validation in Photo
remove objects' relationships.
add note for future me
no need to keep managedObject here.
photos and albums seem to be working now
fix some photos appear in album they don't belong to
refactor array strings generator
fix crash on showing horizontal photos