Squashed 'colorjs-lib/' changes from a204941..bccc9a4

bccc9a4 updated README, package.json
9428c28 tests running with minified file
5748adf switching to UglifyJS2 compiler
67b5c00 initial tests
85d4910 toString is the same as CSS
52d115a jshint cleanup

git-subtree-dir: colorjs-lib
git-subtree-split: bccc9a4fa4d8fb2d519e1ec15608145a6d1a2300
Merge commit '115f9176a9f4df932c28a7e19b27f3b26a7b44d4'
#underlineHighlight color update