BATON ROUGE — Raising Cane's is celebrating its 30th anniversary this week, and founder and CEO Todd Graves marked the occasion at the first Cane's location off LSU's campus on Highland Road on Tuesday.There was a special cake made to mark the occasion at the "Mothership" location, which started as a small chicken restaurant near LSU in 1996. Now, the company has gone international, with more than 1,000 locations across 45 states and several cou…