Document how to modify the set of commands executed by mlDeploy

[rjrudin]

[grtjn]

e.g. mlDeploy.finalizedBy myDoSomethingExtraTask or mlPostDeploy.dependsOn ...

I often hook up extra tasks using dependsOn or finalizedBy, and not just mlDeploy, but also mlLoadData etc, for instance to load configs as part of mlloadmodules, or load test data as part of mlloaddata (only if mlTestRestPort is specified), etc..