Purchase on i-Tunes     There’s absolutely nothing that St. Petersburg poster child Famous Kid Brick cannot do. Holding the Sunshine State captive for the past 6 months with regional hit single “I’m On It,” Brick recently released follow-up single “Dumb Doe” to rave reviews. The single is already in mixshow rotation on WLLD 94.1 in Tampa and is catching a few spins on 102 Jamz in Orlando and …