redirected testing files to interal files in resources, began implementa...

This is a required update to the GATKTestBackend.
It now features

- Running through JUnit Test
- Usage of Internal testing files through /src/main/resources

There is still the ongoing issue of maven not building it properly, however.
I believe this should be safe for merging to develop, I have spoken to Jonathan about this (consolidating a single resource folder).