ext42-appsdk-bump-app-catalog 29 bumping sdk to 60-c3bd9c0

sdk commit: RallySoftware/appsdk@72daa173a27a52da2477b066f37d6a3f64e0027f
author: Matt Parrish
message: Revert "Removing  line from closure scss file"

sdk commit: RallySoftware/appsdk@959d102445a5cbdb80658999948dfcd59a9685ac
author: Matt Parrish
message: Revert "Moving rally lib-closure CSS into rui package"

sdk commit: RallySoftware/appsdk@c3bd9c0df061779cb571c9d75b9e0bacadb51550
author: Matt Parrish
message: Getting lib-closure.css to compile properly with Ext 4.2