Added gas-phse kinetics to RedlichKwongMFTP class

git-svn-id: https://cantera.googlecode.com/svn/cantera/branches/2.1@2879 02a645c2-efd0-11dd-984d-ab748d24aa7e
Revert commit intended for trunk that ended up on 2.1 maintenance branch

Reverts r2879, which was actually commited to trunk in r2913.

git-svn-id: https://cantera.googlecode.com/svn/cantera/branches/2.1@2917 02a645c2-efd0-11dd-984d-ab748d24aa7e