Make back link go to the right place on block edit screen
Fix back link in layer editor
add public/uploads to gitignore
Add some transition values for layers in the schema
Add transition stuff to table
Image layer edit form can specify pixels in/out and hardcoded transition type
Store transition types in model constant
Add validation and some tests
Fix specs
Add slide transitions, more tests
Refactor to specify start, end, and transition for both in and out on layer model
Add directional values to transitions in layer
Refactor transition model and add value functionality