Species model

creates a factory model and a constructor page for admins.  admins can create new objects using the builder page.
Originally I was going to use this model to do two things: (i) render a "new" partial for each model, and (ii) pass in an instance variable for each model.  For now, I've removed the second function.  I made it just render "templates".  The models are instantiated in the templates, so I don't need to build instances here.