Minor changes regarding mainly Follow

- Show "Unfollow" when hovering & following, "Following" if following
- Hide Follow button in own profile
- Update followers count when following/unfollowing
- Add links to user profile from "added_by" in playlist track list
- Resize auth popup and place it in the middle of the screen
- Fix audio tag reference so it keeps playing next track in queue
- Fix routing so the cuurent page loads when reloading
Merge pull request #17 from JMPerez/follow-minor-changes

Minor changes regarding mainly Follow