ext42-appsdk-bump-app-catalog 55 bumping sdk to 121-668da22

sdk commit: RallySoftware/appsdk@02aceba1746f75a828099b70b34b728e95854219
author: Rally Dev Pair
message: DE19509 - correctly highlight selected date in Ext4.2 DatePicker

sdk commit: RallySoftware/appsdk@9d88fe45869424972ec1d2d91068a85d48644dd5
author: Kyle Morse
message: GridView: do not blow away consumer supplied getRowClass function with btid crap

sdk commit: RallySoftware/appsdk@668da223c70cba7528a2ee3a3186f1b7e1d137a8
author: Rally Dev Pair
message: DE19509 - fix test errors