Add CI badge, update description.

timoxley · Jul 18, 2013 · f55143f · f55143f
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 #overshadow-listeners
+[![Build Status](https://travis-ci.org/timoxley/overshadow-listeners.png?branch=master)](https://travis-ci.org/timoxley/overshadow-listeners)
 
 Add an event listener before existing listeners.
 
+## Why
+
+Event listeners always fire in the order they are added, yet sometimes we have no control over
+this ordering and require certain listeners to definitely run before any others.
+
 ## Example
 
 ```js