By Deepa Seetharaman SAN FRANCISCO (Reuters) – More than 1,000 Hachette Book Group authors including Malcolm Gladwell, Stephen King and James Patterson have urged Amazon.com Incs directors to end a contract dispute with their publisher that has cost some writers 90 percent of their sales on the online retailers website. Authors United, a group representing Hachette authors, called on Amazons 10-person board to end what it called sanctions on Hachette book sales on Amazons website during the dispute between the two companies over e-book prices. …