Modified kappa.py
Modified kappa.py

Added basic documentation to each function. Also made the call to open_file
(to open .gv or .jpg files for contact/influence maps) optional.

spgarbet/pysb,neurord/pysb,alubbock/pysb-legacy,johnbachman/pysb,alubbock/pysb,spgarbet/pysb,johnbachman/pysb,pysb/pysb,LoLab-VU/pysb,alubbock/pysb-legacy,alubbock/pysb-legacy,d-fan/pysb,jmuhlich/pysb,d-fan/pysb,neurord/pysb,neurord/pysb,d-fan/pysb,alubbock/pysb-legacy,LoLab-VU/pysb,spgarbet/pysb