Unittest: test the Species.toCantera() function
Unittest: test the Species.toCantera() function

Doesn't really test thermo and transport, because we already have unit tests for those.

chatelak/RMG-Py,nyee/RMG-Py,chatelak/RMG-Py,nickvandewiele/RMG-Py,nickvandewiele/RMG-Py,pierrelb/RMG-Py,nyee/RMG-Py,pierrelb/RMG-Py