Add getImage() method for AsterCommand.
Add getImage() method for AsterCommand.

liuyq/aster,cuongmv162/aster,leijian/aster,kanru/aster,z7z8th/aster,walkingice/aster,kanru/aster,Ryan2009/aster,walkingice/aster,Ryan2009/aster,liuyq/aster,walkingice/aster,Ryan2009/aster,z7z8th/aster,leijian/aster,cuongmv162/aster,leijian/aster,kanru/aster,liuyq/aster,z7z8th/aster,cuongmv162/aster