Bug fixes, new iTunes link

Users are able to click into an artist's iTunes page while listening,
good for music lovers.
Fixed button state issues.
Optimized code.
Add in whitelist. Before, users couldn't unblock a song as long as
"automatic block" was on. A song would be blocked again even if
unblocked once.
Fixed the display issue. R&B was displayed as R&amp;B in previous
builds.