new dev branch
fix
Merge branch 'dev' of https://github.com/RenzHoly/mytiger into dev

Conflicts:
	chapter2/a.out
	chapter2/driver.o
	chapter2/errormsg.o
	chapter2/lex.yy.c
	chapter2/lex.yy.o
	chapter2/util.o
	chapter3/a.out
	chapter3/errormsg.o
	chapter3/lex.yy.c
	chapter3/lex.yy.o
	chapter3/parsetest.o
	chapter3/test.tig
	chapter3/tiger.y
	chapter3/util.o
	chapter3/y.output
	chapter3/y.tab.c
	chapter3/y.tab.h
	chapter3/y.tab.o