Add d3 based graph vizualization of images akin to docker --viz

I also played around with getting a version of the `--viz` output from the docker client onto the images page.  I got something up, but with a large number of images, it is way too large.  Perhaps It could be put onto the individual pages to show just its subtree, or, with a little extra logic, I could make remove untagged images and link directly between tagged images.  This is all aside from the fact that I'm far from accomplished with Angular and may have made some mistakes there as well.  

I look forward to any feedback.

![screen shot 2014-08-06 at 9 36 12 pm](https://cloud.githubusercontent.com/assets/115752/3837367/6bc0933c-1dec-11e4-9868-9e2d6c2fc5b2.png)