Added hypergeometric dist; made weights optional
Fixed hypergeometric for degenerate mode.
Added hypg dist and -nw flag.
added hypg to test makefile
cleaned up weighting in process_pair (core.py)
Added makefile
Merge branch 'master' of https://github.com/dmcskim/cladecompare

Conflicts:
	cladecomparelib/core.py
Fixed indentation and resolved an unresolved merge conflict