* Claude Nobs dies after several weeks in coma * Founded festival on shores of Lake Geneva in 1967 * Hosted Miles Davis, Ray Charles and Nina Simone (Adds details, changes dateline, adds byline) By Stephanie Nebehay GENEVA, Jan 11 (Reuters) - Claude Nobs, who founded the Montreux Jazz Festival nearly 50 years ago, has died after several weeks in a coma following a skiing accident, the festival said on Friday.