Westerns are continuing to have their moment in Hollywood, with this weekend's " Cowboys & Aliens " looking to pick up where last winter's breakout " True Grit " left off. Now another project is gathering heat. " The Creed of Violence , a western-flavored script based on the 2010 novel from cult author Boston Teran, has attracted the attention of Leonardo DiCaprio , who's eager to play one of the lead roles, according to a person who was briefed on the actor's plans but could not talk about it publicly because he was not authorized to speak for DiCaprio. DiCaprio has been offered a lead part but has not decided whether he will accept it yet, a source said. " Creed " tells the 1910-era story of a criminal named Rawbone who tries to take a cache of weapons into Mexico as part of the country's revolution but is caught and then accompanied by a government agent who, it turns out, shares a secret past with him. The movie has