American Blood is the definitive collection of writer-artist Benjamin Marra’s provocative, self-published comics stories from the past several years, including “Gangsta Rap Posse,” “The Naked Heroes,” “Lincoln Washington,” “Ripper,” and “The Incredibly Fantastic Adventures of Maureen Dowd” (in which the controversial political columnist must fight off fanatic White House officials and Hezbollah commandos in time to file her most important column yet and make a date with George Clooney).