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

[aakatz3]

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???