Closure-ify(still working): Barchart, Button, MultipleChoiceQ, MultiSelect, RadioGroup, AnserMan and SubmitManager
Working with brix in MulmultiSelectTests.html page
MultiSelectTests.html page is working with closure
Merge pull request #90 from ysahnpark/ClosureOOP_youngsuk

Closure-ify(still working): Barchart, Button, MultipleChoiceQ, MultiSele...
MultipleChoiceQuestion and MultiSelectQuestion brix working with demo files
answermanpolling.js compiled with Closure
Merge pull request #91 from ysahnpark/ClosureOOP_youngsuk

Migrated MultipleChoiceQuestion and MultiSelectQuestion (including demo file and dependencies) to Closure
Messaging: unsubscibe & guard duplicate subscribe
Messaging: format agreed with Inkling
Messaging unitest retrofit
Added multiselect demo and test spec files (that I forgot to include)
Merge pull request #92 from ysahnpark/EventManagerEnhance

Event Manager and MessageBroker enhancements
Fix legend overwriting on redraw

fix missing y value for added white piechart wedge when given
data doesn't add to full pie.
also small fix to piechart update handler on kantorowski page