update p2diff so it will compile against Luna, Tycho 0.20, and JUnit 4.11
move tycho-p2-director-plugin:materialize-products into the product definition where it's needed
Merge pull request #2 from nickboldt/update-to-luna-M6

update p2diff so it will compile against Luna, Tycho 0.20, and JUnit 4.11 >> master