kleen star implemented
final merged
- Coded the union operator in nfa class [Not checked for any errors now]
	union of alphabets
	incrementing the num_states
	updating the transitions table
- Added the return call in union_nfa
Merge branch 'master' of https://github.com/nullstring/compiler
- Kleene Star operator by Harsh Mehta
started eps_closure and concat
end
- Completed coding the RE->POSTFIX & Evaluation of POSTFIX regular
	expression.
- TODO: Compile the NFA class along with the code written by nullstring
	Test the code & debug the errors
Concat implemented
Merge branch 'master' of https://github.com/nullstring/compiler

Conflicts:
	Assignment2/lex/nfa.cpp
- Dealt with conflicts.. still some problems may be in indent tabs
- Deleted the useless hash codes in the nfa.cpp
dfa.match() implemented
dfa.match() implemented
Trying to merge