appsdk-bump-app-catalog 296 bumping sdk to 1512-b4778f1

sdk commit: RallySoftware/appsdk@933e7d80158c38b3499968ee0320ee8a79e503cc
author: Stefan Kendall
message: DE19727 Fixed ready/blocked buttons triggering concurrency conflicts

sdk commit: RallySoftware/appsdk@b4778f156ace3c9949c0dfd66725636f44d93cbc
author: Stefan Kendall
message: Revert "DE19727 Fixed ready/blocked buttons triggering concurrency conflicts"