Notify children when parent pom changes

[concon121]

When a pom file which has children is modified, it should notify its children, who should notify their children etc... Mostly, nothing will happen as changes to the parent pom object will be reflected in any other pom object which holds a reference to that parent pom. However, if the child is in the workspace then we should reload the classpath and display warnings on the ui if those changes broke the project model.