Version 0.5.4

• Add minified build.

Version 0.5.3

• Use the stable version of Uglify

Version 0.5.2

• Use ES5 syntax to use stable Uglify.

Version 0.5.1

• Throw error if selector is not a string.

Version 0.5.0

• Complete rewrite using Rollup. Subunit now just depends on several D3 4.0 modules.