Split build and deployment details into separate closures of the cicsBundle extension

[ind1go]

As per #7, split the build-specific and deployment-specific details of the cicsBundle extension so that the purpose of each property can be distinguished.

cicsBundle {
    build {    
        defaultJVMServer = "MYJVM"
    }
    deploy {
	cicsplex = "..."
	region = "..."
	bunddef = "..."
	csdgroup = "..."
	url = "..."
	username = "..."
	password = "..."
	insecure = false
    }
}