dynamically load page to use instead of having to require pages one by one

instead of requiring pages one by one
https://github.com/yahoo/flux-examples/blob/master/routing/components/Application.jsx#L8-L10
and using a switch statement to determine page to render 
https://github.com/yahoo/flux-examples/blob/master/routing/components/Application.jsx#L8-L10

dynamically determine class to load based on page name
https://github.com/brandonwoo/flux-examples/blob/improvement/page_to_render/routing/components/Application.jsx#L27-L46