Minor packaging changes

Thanks for the lib—it’s sweet. I made a few packaging improvements so it can be used even more widely:

1. Using minified scripts as a package endpoint is considered bad practice, because they usually get minified again in the final build step.
1. Since Rebound already supports CommonJS exports (Node-style) and has no external dependencies, it’s also compatible with [Component](http://component.github.io/component.io/). The `component.json` data is based on `package.json`’s contents (and the Component spec).
1. I noticed the version number `bower.json` wasn’t up-to-date, so it’s fixed now. 

Feel free to cherry-pick some of the changes.