Update Caret SQL Generation demo

[antoinecarme]

This demo is getting old. A lot of models have been added in the meantime.

https://github.com/antoinecarme/caret2sql/tree/master/demo

Missing Models : earth, ctree, ctree2, cforest, linear and polynomial SVMs

Missing databases : DB2 and Teradata

[antoinecarme]

FIXED