Ricky Gervais, on television, has a perfect streak going. BBC's "The Office", the original series in which he starred, and which co-wrote with Stephen Merchant: brilliant. HBO's Extras, the series featuring both him and Merchant on-camera as well as off: brilliant. Gervais' HBO stand-up special: brilliant. And now comes "The Ricky Gervais Show", an animated HBO version of an ongoing series of conversational podcasts. And guess what? It, too, is brilliant...