LYR-133: return itunes URL instead of string to albums and songs with iTunes field filled
LYR-133 added "placeholder" for new global $wgLyricsItunesAffiliateToken in DefaultSettings.php
LYR-133: fixed itunes for getSong
Merge pull request #3414 from Wikia/LYR-133

LYR-133 Return iTunes link instead of iTunes ID in albums/songs responses