Fixes cmap sanitizer fro #215
Add feature test for blend mode.
Create color maps for single component color spaces.
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.
Merge pull request #2652 from yurydelendik/issue-215-1

Fixes cmap sanitizer for #215