appsdk-bump-app-catalog 445 bumping sdk to 1915-1a55712

sdk commit: RallySoftware/appsdk@cc2b8837f493365a2499a7817abe86714fe10554
author: Steve Neely and Trevor Farlow
message: DE20551: On Iteration scoped pages, don't default to Unscheduled

sdk commit: RallySoftware/appsdk@335e9f48617ed792f9e0aa392a4364fc1f9927d5
author: Steve Neely and Trevor Farlow
message: jshint

sdk commit: RallySoftware/appsdk@c28f1cf88bf3d96a090af5b47e9ff6fe212fa819
author: Steve Neely and Trevor Farlow
message: DE20598: Add Task with no name returns an error

sdk commit: RallySoftware/appsdk@1a557123d887731ce44421abe72a08f01f5b9886
author: Steve Neely and Trevor Farlow
message: Fixing borken tests