Merge pull request #1 from bingam/master

try!!!
Merge pull request #2 from bingam/master

skeleton
Merge pull request #3 from bingam/master

confused!!!!
Merge pull request #4 from bingam/master

we are getting there!(kind of)
Merge pull request #5 from bingam/master

Need to finish up map/var/let
added AST visitor for binoApp
Merge branch 'master' of https://github.com/forever2xxx/411-hw2