appsdk-bump-app-catalog 397 bumping sdk to 1812-ca613ac

sdk commit: RallySoftware/appsdk@991d656ae041bbe7e78f60cbeeb7b65b9a89105c
author: Stefan Kendall
message: DE20313 Task tab is now disabled after creating a story.

sdk commit: RallySoftware/appsdk@a9f03d0aa0e9116889f4c74d8206f3cf6af14633
author: Stefan Kendall
message: Revert "DE20313 Task tab is now disabled after creating a story."

sdk commit: RallySoftware/appsdk@47dcc6019465859890aa4ade47e2e76582de0b94
author: Stefan Kendall
message: DE18879 Attachment list now updates when an image is added to a rich text field.

sdk commit: RallySoftware/appsdk@ca613aca6500ba7aea2b109d36175a5829231565
author: Stefan Kendall
message: Revert "Revert "DE20313 Task tab is now disabled after creating a story.""