LONDON (Reuters) – Famous directors, fans and even Darth Vader congratulated "Star Wars" creator George Lucas on Tuesday on his marriage to long-time girlfriend Mellody Hobson at his Skywalker ranch in California. Huffington Post founder Arianna Huffington, who was at the wedding on Saturday, tweeted a picture of Lucas in white tie with a white flower on his label and his bride in a white dress with a veil. "The visionary "Star Wars" filmmaker wed the Ariel Investments president before an intimate gathering," Huffington wrote in a report for her news and gossip website. …