Write a Python program that takes as input a set of DNA sequences
and outputs a neighbor joining tree from a Jukes-Cantor distance
matrix. 

Submit one .py file containing your solution. You may test your
program on the data given on the class website.

HOW TO SUBMIT YOUR ASSIGNMENT:

Copy your solution to your course directory 

/afs/cad/courses/bnfo/s16/bnfo/236/002/<UCID>

Use the Unix command 

cp <yoursolution>.py /afs/cad/courses/bnfo/s16/bnfo/236/002/<UCID>/

DUE DATE: 1:00pm, April 28th, 2016

Good luck!