Write a Python program that takes a set of aligned sequences in 
FASTA format, computes the Jukes-Cantor distance matrix, and outputs
the neighbor joining tree with correct species name.

Your completed program is due April 24th 2018.

Copy your nj.py program into 
/afs/cad/courses/bnfo/s18/bnfo/602/002/<UCID>/ where we will run 
it for evaluation.