Adding a link to the travis build image to the readme

README.md

@@ -2,7 +2,7 @@
 
 Inspired by the work of Mike Bostock's [Towards Reusable Charts](http://bost.ocks.org/mike/chart/), and supported by a combined effort of [Novus](http://www.novus.com) and the NVD3 community.
 
-[View Examples](http://nvd3-community.github.io/nvd3/) | [NEW Documentation!](http://nvd3-community.github.io/nvd3/examples/documentation.html)
+[View Examples](http://nvd3-community.github.io/nvd3/) | [NEW Documentation!](http://nvd3-community.github.io/nvd3/examples/documentation.html) | Development build status: [![Build Status](https://travis-ci.org/novus/nvd3.svg?branch=development)](https://travis-ci.org/novus/nvd3)
 
 ## Usage
 Simply add the `nv.d3` assets to your project and include them in your HTML.