finishing touches on confidence level which is now more vote duration percent

confidence level is now calculated by taking the vote time for the most recent
user vote and dividing that by the duration of the poll. that gets the percent
which then is averaged out of the voters last 10 polls.
storing confidence level in user stats
storing confidence levels and their average, confidence level, in user stats
corrected rollingvote to actually store in the correct path.
updated to payout storage on poll creation

also updated payout calulator.
Merge pull request #11 from paulgrock/confidence-ranking

Confidence ranking