Merge pull request #4 from Futrell/master

More inverses.
Replace Mathematica's massively over-complex and numerically unstable inverse by 2 lines of code
remove some non-code detritus from CIECAM02 reorg
change LICENSE file to not name me directly now that I'm not the only copyright holder!
Consistently put XYZ on 0-100 scale instead of sometimes 0-100 and sometimes 0-1.
Merge pull request #5 from njsmith/XYZ-100

Consistently put XYZ on 0-100 scale instead of sometimes 0-100 and sometimes 0-1.
fix assertion so it doesn't fail for nans