Synch with BitField from dolphin master.
Add tests for primitive rasterization rules and clipping coordinate precision.
Fix rasterization rule test and add add tables for lots of values.
Add more tests for rasterization rules.
Test rounding for lighting computation.

This only tests lighting without any lights at the moment.
Lighting test: add comment explaining test.
Merge pull request #1 from magumagu/lighting

Test rounding for lighting computation.