Fix issues with namespaced routes not rendering templates properly.

- Removed Sinatra::Namespace routes as they are not compatible with mustache/sinatra
- Reverted all view files to work as they do in the rest of the app
- Renamed post view to post_index with corresponding PostIndex class for
compatibility reasons
- Began implementing methods to route variables from controller to view
post.mustache is now post_index to avoid class name classes with Post resource.
Add helpers for application and post routes.
Remove sinatra/namespace and clean up config code a little.
Begin implementing dashboard methods.