By Lisa Richwine LOS ANGELES (Reuters) -An unidentified woman has filed a civil lawsuit that accuses American rapper Snoop Dogg of sexual assault and battery after she attended one of his concerts in 2013, allegations the musician’s spokesperson called a meritless “shakedown.” The lawsuit was filed on Wednesday, days before Snoop Dogg is set to perform https://www.reuters.com/article/us-football-nfl-superbowl-halftime-idCAKBN2KF2IH at the Super Bowl halftime show with other hip-hop artists near Los Angeles. The woman was identified as Jane Doe and described as a dancer, model, host and actress…