primus / eventemitter3 / 147

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Pull #62

travis-ci

Add license, iife wrapper, and cleanup exports

I've added the license to the top of the file, which helps it be used standalone, or when injected as a `<script>` directly from bower_modules.

Likewise, when used as a direct script, there are a few leaks into global context, the iife wrapper prevents that.

With the IIFE wrapper, I added an explicit addition to the context/window.  This is so the script can be used outside of CJS environment, such as direct include with bower.

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