Add votes to comments
Clean up comment controller
Scope vote uniqueness validation to voteable_id and voteable_type not just voteable type. (setting voteable_type only as the scope for the uniqueness validation on the vote model would make it so that an individual can only like one object of a certain type)
Change voting mechanism to AJAX! + alert box for errors
Add AJAX voting to comments and add alert to HTML modality of voting just in case