Add feature test for blend mode.
Create color maps for single component color spaces.
Correct a typo in DeviceRgbCS_getRgbBuffer
Merge pull request #2987 from vyv03354/issue2982

Correct a typo in DeviceRgbCS_getRgbBuffer
Add PDF.js license to package.json
Merge pull request #2999 from theoreticaLee/master

Add PDF.js license to package.json
Merge pull request #2978 from brendandahl/color-maps

Create color maps for single component color spaces.
Merge pull request #2972 from brendandahl/blend-mode-feature-test

Add feature test for blend mode.