Fix boundary cases for `cie_color_match()`, such as 379.5 nanometers.
Merge pull request #34 from glenn-sweeney/color_match_fix

Fix boundary cases for cie_color_match().
Fix variable names in whitebalance.
Better writemime for color arrays and matrices. Fixes #14, fixes #35
Fix incorrect colordiff on 32bit cpus. Fixes #29