Fixed issues with round changing

Added startNextRound function and kept round changing code out of calls
to different Firebase.transaction()
Simplified voting objects
Added winner's circle
Fixed background position
Added winner's circle JS and voting object removal
Add tracks to playlists automatically on the back end
Handle winner's circle on removal
Adjusted time indicator
Padded winner's circle
Removed numVotesElem checks on child_changed

No longer necessary since the number of votes isn’t displayed on the
voting object anymore
Update winner's circle on load
Removed commented out ajax call to add_leader_to_playlist
Changed time indicator to number of seconds
Removed main.css from .gitignore
Updated access token in add to playlist code

Happens if the POST to Spotify fails because the access token is expired
Cleaned up addLeaderToPlaylist function
Changed add_track_to_playlist to addTrackToPlaylist
Changed refreshToken API to accept the refresh token as a parameter

Removed params hash and updated search function
Removed box shadow from window selection bar
Merge pull request #2 from ofagbemi/voting-page

Voting page