Seo

This includes:
1. a 'pre-render' feature, turned on by default for the production environment.
2. SPDY turned off by default, since it requires SSL. If SSL certs are added to the config, SPDY will be available.
3. Livereload, turned on by default in Local environment only.
The last two features are a little outside the scope of my assignment. If they're not appreciated, I can revert those commits.
Also, express has been updated.