Add quant.h and fix signature confusion of some functions
Merge branch 'release-1.0' into develop
Merge branch 'master' into develop
Fix a typo of --quality option value
Make faster monochrome dithering
Don't create cache table when it is not needed
Bump version
Merge branch 'develop' into release-1.0
Merge branch 'feature-fast-mono-dither' into release-1.0
Merge branch 'release-1.0'