Fixes vibrant quartz glass using the wrong model.

Fixes matrix frame not having a model (the block is transparent though).
Don't register an item model for the invalid part anymore.
Make variant registration for items more explicit.
This fixes #5

src/main/java/appeng/bootstrap/BlockDefinitionBuilder.java

@@ -130,7 +130,8 @@ class BlockDefinitionBuilder implements IBlockBuilder
 			@SideOnly( Side.CLIENT )
 			public void customize( IBlockRendering rendering, IItemRendering itemRendering )
 			{
-				itemRendering.model( new ModelResourceLocation( new ResourceLocation( AppEng.MOD_ID, registryName ), "inventory" ) );
+				ModelResourceLocation model = new ModelResourceLocation( new ResourceLocation( AppEng.MOD_ID, registryName ), "inventory" );
+				itemRendering.model( model ).variants( model );
 			}
 		} );