Adds navigation control buttons on top of the canvas layer to allow touch screen users to pan or zoom the chart.

Flot plugin that adds some navigation controls on top of the canvas layer to allow users pan or zoom the graph. This is even more helpful for the touch screen users.
![screenshot](https://f.cloud.github.com/assets/3367820/846672/2d0605d0-f41e-11e2-80ea-e8d9fb6c92d1.png)