Addressing a couple of errors and warnings encountered

When initially running this generator using the MVC template, starting node failed due to a missing fs package import. I added this to the top of the mvc/app.js template file to address the issue.

After adding this in, a warning was issued for bodyparser, which I addressed by adding ```extended: true``` to the bodyParser use call. For the sake of thoroughness, I searched the rest of the project and made this change in two places, the basic app template and the mvc template.