By Denny Dyroff, Entertainment Editor, The Times Kid Koala   Eric San will be performing in Philadelphia on May 17, but you won’t find his name on any venue listings. His fans, however, know that he’s coming because they know he performs under his entertainment alias – Kid Koala. On May 17, Kid Koala will bring his “Kid Koala’s Vinyl Vaudeville Floor Kids Edition” to Johnny Brenda’s...