c-for, for-in, for-of

c-for, for-in, for-of pass several tests
it's time to code compiler now. (2014-5-1)
basically finish parser, start to code compiler

basically finish parser, start to compiler. no evaluate, only compile
compile taijilang: if, assign, begin, +, let

start coding compile taijilang, if, assign, begin, +, let pass some tests