Express 4 now uses "method-override" external library.
Fixing bug when updating pet name in MVC example.
Fix "method-override" dependency.

Depend on method-override@1.0.0 strictly, following the pattern for (almost) all other devDependencies.
Fixing bug in MVC example pet view.
Merge pull request #2060 from swrh/master

examples: Fix bugs in MVC example