Pie with legends

* updated Pie graphs to put legends in the right spot next to pie
* updated legends with redraw (not quite working yet - makes pile of legend labels)
* cleansing css
MultiSelectQuestion with unit test
Retrofit the MultiChosePolling (PrototypeForm/bric-answerprovider.js)
Merge pull request #89 from ysahnpark/youngsuk

Changes to MultiSelectQuestion