Add method to cleanup output IR code
IR now puts labels in right place, before function stat-seq
Labels are now IDs and can be converted into label using emitLabel(id)
Closes issue #73
Edit grammar (tiger.g) to return SymbolTable post-parse
Edit tree grammar to require symbol table in constructor (#69)
Start work on issue #69
Merge branch 'master' of https://github.com/CS4240-tiger/tiger-compiler

Conflicts:
	bin/tigerParser$assign_stat_return.class
	bin/tigerParser$base_type_return.class
	bin/tigerParser$begin_return.class
	bin/tigerParser$binary_operator_return.class
	bin/tigerParser$block_end_return.class
	bin/tigerParser$block_list_return.class
	bin/tigerParser$block_return.class
	bin/tigerParser$break_stat_return.class
	bin/tigerParser$constval_return.class
	bin/tigerParser$declaration_statement_return.class
	bin/tigerParser$expr_list_return.class
	bin/tigerParser$fixedptlit_return.class
	bin/tigerParser$for_stat_return.class
	bin/tigerParser$func_call_return.class
	bin/tigerParser$func_param_list_return.class
	bin/tigerParser$funct_declaration_list_return.class
	bin/tigerParser$funct_declaration_return.class
	bin/tigerParser$id_list_return.class
	bin/tigerParser$if_stat_return.class
	bin/tigerParser$index_expr_return.class
	bin/tigerParser$index_oper_return.class
	bin/tigerParser$intlit_return.class
	bin/tigerParser$keywords_return.class
	bin/tigerParser$param_list_return.class
	bin/tigerParser$param_return.class
	bin/tigerParser$ret_type_return.class
	bin/tigerParser$return_func_return.class
	bin/tigerParser$return_stat_return.class
	bin/tigerParser$stat_return.class
	bin/tigerParser$stat_seq_return.class
	bin/tigerParser$tiger_program_return.class
	bin/tigerParser$type_declaration_list_return.class
	bin/tigerParser$type_declaration_return.class
	bin/tigerParser$type_id_return.class
	bin/tigerParser$type_return.class
	bin/tigerParser$value_return.class
	bin/tigerParser$var_declaration_list_return.class
	bin/tigerParser$var_declaration_return.class
	bin/tigerParser$void_func_return.class
	bin/tigerParser$while_stat_return.class
	bin/tigerParser.class
	output/tigerLexer.java
	output/tigerParser.java