Add an IPython integration

[danvk]

@timodonnell has talked about this in the past. It shouldn't be hard to do & would greatly increase the ease with which pileup.js could be used. This would probably tie into pysam somehow.

[danvk]

It should be a widget — options like range could be set interactively.

[ihodes]

http://blog.thedataincubator.com/2015/08/embedding-d3-in-an-ipython-notebook/

[hammer]

Cf. https://github.com/igvteam/igv.js/issues/222