Don't throw error when module names are numbers

[dylang]

• Don't throw error when modules are numbers. Browserify and Webpack can cause this in the bundles they create.
• Update dependencies
• Update travis for latest versions of node and iojs

[rumpl]

Hey @dylang,

Thanks once again for the pull request.

I bumped the version and published it on npm, you can update your dependencies.

By the way, do you want me to add you to this repository since you did pretty much all the work lately.

Cheers