chore: Add minification!

* Add the `grunt uglify` task
* Add a `default` task that calls `browserify` and `uglfiy`
* Add a minified artifact to the checkin.
* Update documentation about the default data-load_url and data-unload_url endpoints.

fixes #8
Merge pull request #9 from shane-tomlinson/issue-8-uglify

chore: Add minification!