Add a matrix multiplication routine and some tests
Fill out main(). Still some unresolved issues.
Fix matrix multiplication and more goodness
More unit test goodness, and an optimization
Merge branch 'master' of github.com:ResearchComputing/HPSC-Fall-2013
Add pi.c, which does busy work
Update Makefile
Add gitignore
Make python implementation conform to output spec

Before, the matrices created by matrix_multiply.py were not prefixed
with the dimensions of the resulting matrix.
Merge branch 'fixes'