setDead method
added check if new state was a dead state
Merge branch 'master' of https://github.com/swgillespie/ParserGenerator.git
made single dead state, will be last state in DFA (in the last index)
public variable dead to be able to check if a state is dead, method
setDead to set a state as dead
added single dead state which will be last state in DFA (in the last
index of the dfa arraylist)