Enable increasing and decreasing of votes

Hooks in a new knockout array to represent the points per option, and
has the increase/decrease methods alter the value for a given row.

Adds limits to stop values from exceeding 3 points per vote, 7 points
total, or from becoming negative.
Glue it all together

Hooks up the back end to write the points votes to the database, and the
front-end to chart the results