Testing resources not combined, causing some tests that require resources to fail (particularly mockbukkit)

Mockbukkit cannot find plugin.yml if you run tests on the root project, but it works for subprojects

Fix: define processresources on root to copy all resources from all subprojects (for tests) into the main build resources subfolder. NOTE: this may cause issues in the future; there might also be a way to fix via mockbukkit???