ad-hoc sub process completion conditions not implemented

Within the properties for an AdHoc SubProcess node is a field to enter a completion condition for the node with a language selector for either java or mvel.

These completion conditions do not seem to be implemented. The only condition supported is

"getActivityInstanceAttribute("numberOfActiveInstances") == 0"

and the implementation of the condition in AdHocSubProcessHandler.java is a string compare against this expression and setting a flag "autoComplete" on the node.

This should be implemented to support any valid java or mvel expression given in the properties.