Add UMD support for use via npmcdn.com

[bclinkinbeard]

This simply adds a UMD build so the lib can be used from places like JSBin, via npmcdn.com

I also added a npm run release script to enable running the build as part of the publish process. I did not use prepublish since it runs on install as well.

[TooTallNate]

Why not just use a common js compatible CDN like https://wzrd.in/standalone/util-inspect@latest ?

[LinusU]

I agree with TooTallNate and actually think that we shouldn't publish a UMD package. It will be downloaded to everyone using this module, even though it won't be needed.

That being said, just for reference, I would also recommend using prepublish script to ensure that it always runs before publishing a new version, and to add browserify to the devDependencies so that it's available when it's time to build. Might be good to know if you want to do this in any other repo 👌

[bclinkinbeard]

Fair points