Submit HW9

[Notebook Viewer link](http://nbviewer.ipython.org/github/cosmoharrigan/distributed-fractals/blob/master/fractal.ipynb)

In this exercise, I have chosen to implement distributed computation of the Mandelbrot Set fractal. Extending the code that we used in a prior exercise, I introduced **compute_column** and **compute_region** functions to make the process amenable to distributed computation. In the notebook, I compare the execution time of the fractal generator on one core with the execution time across the compute cluster. On an 8-core cluster, a speedup of approximately 3 times was measured.