Fixed 404 handling in app generator.

Return 404 instead of 500 for show action on unknown resource id.

Signed-off-by: Magne Land <magne.land@appfolio.com>
Skip response_template block after rebasing fix from master.

Signed-off-by: Magne Land <magne.land@appfolio.com>
Merge pull request #11 from magneland/10-fix_app_generator

Fixed 404 handling in app generator.