Don't unregister Mek stuff. Valid Oredict Entries are needed to remove them from the GT Extruder.

Revert "Remove mekanism processing materials from oreDict"

This reverts commit bf3bfbed11227686991c2d3d1a50a70565c9fe2b.
Merge pull request #78 from Johannes13/dev

Don't unregister Mek stuff. Valid Oredict Entries are needed to remove...