Added CanTherm class to rmgpy.cantherm.main module.
Added CanTherm class to rmgpy.cantherm.main module.

The CanTherm class represents an instance of a CanTherm job, used to
compute properties of species and reactions. Wrapping this functionality
in a class enables us to more easily generate jobs programmatically as
well as using input files. Methods for parsing the command-line arguments,
initializing the logging system, and running the job are provided.

KEHANG/RMG-Py,faribas/RMG-Py,nyee/RMG-Py,KEHANG/RMG-Py,enochd/RMG-Py,enochd/RMG-Py,pierrelb/RMG-Py,comocheng/RMG-Py,chatelak/RMG-Py,nickvandewiele/RMG-Py,chatelak/RMG-Py,pierrelb/RMG-Py,faribas/RMG-Py,nickvandewiele/RMG-Py,nyee/RMG-Py,comocheng/RMG-Py