Diversify Ratings

Its difficult to keep desired attributes. Expanding the ratings from ++/-- to a tiered system -3 to +3 excluding 0. Hopefully in this manner convincing the algorithm to procreate and spread the desirable attributes will be easier for the user.

Modified voted function to handle new arguments

Expanded voting buttons to 6 buttons with labels -3 to +3 excluding 0.
Updated instructions

Updated instructions to reflect new rating system.
Merge pull request #1 from reidtc82/Better-Scoring

Better scoring