I'm sitting here in my Cambridge office, hoping the temperature really does hit 50 degrees today, but in my heart I'm in California. In print, too: The San Francisco Chronicle ran my review of "Revenge of the Spellmans" today. Fun book - and if any of you liked the first of the series, and the second less so, take heart. Lisa Lutz has discovered new sources for madcap mayhem in this third outing.…