added functionality for voting on a question and an answer via polymorph...

We created preliminary functionality to the show question pages. We're able to upvote and downvote via two new routes within the vote controller. We also modified the routes and added a new REST member "vote".

Note that we do not have validation so at the moment we're able to upvote/ downvote many many times. That will change in the upcoming feature that'll start refining this mvp.