Use poll:meetingid key and and number of answers field#1

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tdxdave wants to merge 2 commits intomyprogrammingblog:masterfrom

Commits on Nov 18, 2012

Make polling redis keys easier to distinguish. Record number of answers to make it easier to pull out answer data on recording/archive
tdxdave
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Commits on Nov 28, 2012

Finish resolving all the places where the poll key needs to be addressed to new key format
tdxdave
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