added keywords try, catch, and throw to emacs mode for clay.
added keywords try, catch, and throw to emacs mode for clay.

mario-campos/clay,iamrekcah/clay,jckarter/clay,mario-campos/clay,aep/clay,aep/clay,jckarter/clay,iamrekcah/clay,jckarter/clay,jckarter/clay,aep/clay,iamrekcah/clay,aep/clay,aep/clay,mario-campos/clay,jckarter/clay,iamrekcah/clay,mario-campos/clay,aep/clay,mario-campos/clay,jckarter/clay,iamrekcah/clay