appsdk-bump-app-catalog 224 bumping sdk to 1278-abf11b3

sdk commit: RallySoftware/appsdk@c6dd6f309668b2ec242eb3f10eaf2f8103064cb4
author: Dave Thompson
message: DE19420: Refactorred app settings loader to be simpler and more performant.

sdk commit: RallySoftware/appsdk@fb14201a1bf5ed695685a7d518f571996881b124
author: Dave Thompson
message: Revert "DE19420: Refactorred app settings loader to be simpler and more performant."

sdk commit: RallySoftware/appsdk@2152f3ff4cfa0b48266ce7b34ed82bf95e6b6501
author: Kyle Morse
message: Make Rally.domain.WsapiModel.save return a promise

sdk commit: RallySoftware/appsdk@15e87a79a2d6c084c308b56a8057d8db8b82864d
author: Matt Parrish
message: Handling exceptions thrown in WsapiModel.save callback.

sdk commit: RallySoftware/appsdk@abf11b3f0f54789ae73b6ef79d9d3d70cea3f72d
author: Dave Thompson
message: Reapply DE19420: Refactorred app settings loader to be simpler and more performant.