Routing in modular-backbone example 

In modular-backbone example hosted in 
http://backbonetutorials.com/examples/modular-backbone , I got some routing problem.

Reproduction step : 
  click "contributors" link , and after click 'Projects' link without waiting for contributors page.

problem : 
 URL shows "http://backbonetutorials.com/examples/modular-backbone/#/projects" 
 but contributors is opened.
