Allow parsing a non-leaf module in a reactor build

[fabapp2]

Example:

Given a reactor build with four pom.xml: parent, A, B, and C where A depends on B and B depends on C.

When a dependency is added to B and the classpath changed

Then modules A and B must be parsed again to resolve the new types added.
While C is not required to be parsed again (it didn't change), the types provided by C must be made available when parsing B, and B's types must be made available when parsing C and so forth.