User jade templating system instead of ejs.
Add parameter for the page title when rendering template.
Refactor config files

- Parametrize the configuration type by env variable NODE_ENV
- Add config.root parameter (the rootPath)
- Refactor configDB.url
Add static resources management. Add bootstrap 3.1.1 and jquery 1.11.0 as well.
Implement style using bootstrap. Add fontawesome for the icons.
[bugfix] fix a deconection problem when rendering the root page.