The company believes it can double its North American footprint to 7,000 locations.At first glance, one could easily assume they missed the boat with Chipotle (CMG 2.26%). The fast-casual restaurant chain surged following the announcement of its 50-for-1 stock split. Additionally, the stock is up more than 120-fold since launching its IPO at a split-adjusted $0.44 per share in 2006.Still, its footprint of more than 3,500 locations likely does not mean the stock is done growing yet. Here's how investors can ...