Publish to NPM

[HaNdTriX]

I would be really nice to publish this lib to NPM and use something like CommonJS or ES Modules.

[DaddingtonPalace]

We're pretty much in maintenance mode at this point. Can you explain what NPM, CommonJS and ES Modules are and the benefit of the proposed change?

[MatrixFrog]

IIRC you can add a github repository/commit ID as a dependency in an NPM package, so that is likely your best option for now.

[HaNdTriX]

Since I am using webpack as a build system it would be really nice to be able install this lib via npm.

Therefore we need to get rid of global variables and export the analytics Object by using some kind of module pattern.
One way to solve this issue and stay backwards compatible would be to use UMD (Universal Module Definition).

As a quick solution I copied the bundle and exported the analytics Object manually.