changed initial tags to popular tags, and added in a call to the service function
brought in use of factory to know current tag that's being viewed
created a funciton to "get" info related to a tag
minor changes to tag view
added route params check to make sure directly going to a tag's url will give info
added vote function
added score property to our fake data
added vote click function for each link object
Merge pull request #11 from bwest87/master

up/down voting functions. refactored category page creation.