Remove empty stages from the db.
Go to next stage if we are at last level in current stage.
Reset script_level positions
Comment for next stage.
Merge pull request #664 from code-dot-org/script-stages-empty

Script stages empty
ui test improvements
Merge pull request #684 from code-dot-org/uiTests

ui test improvements
studio: update instructions to match sprite image names
Merge pull request #685 from code-dot-org/finished

deploy to delivered