Save both core and edge species are in 'species' folder when saving output HTML file.
Save both core and edge species are in 'species' folder when saving output HTML file.

This is so we don't end up with broken images when there are core species in the
edge species html page.

Unlike the chemkin file, the output HTML file does not include both core + edge.
It only includes edge.

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