* Incorporated development + production builds into /dist (#64) and
updated Readme to include CDN/External information.

* Dropping references to Webpack specific build configurations in Readme
and adding clarity for CDN/external.

* Fixes #69: Adding capability to reduce production build output size and
allow users that import this package to include prop types in
development and optionally remove them using Webpacks UglifyJS + Define
plugin.

* Updated .babelrc that properly wraps prop-types.

* Restoring the original constant declaration for prop types as uglify
does find dead code and remove it.

* Updating changelog.