* Add consolidate middleware to handle the interface between express and handlebars
* Add a middleware to respond to 404s
* Add a branch to the 't' handlebars helper to deal with 't' when invoked in templates written using res.render
* Update grunt tasks to manage dist mode server rendered templates.
BREAKING CHANGE:
The production configuration script must add a new option to its config :
```
page_template_subdirectory: 'dist'
```
issue #554
.