Fix bug reading chemkin reactions.
Fix bug reading chemkin reactions.

If a line had 'rev' in it, the next line was read, but the comment processing
was not done to it, so if you had a line with REV followed by
a line that begins "  !! comment" then it would die.

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