category selection via data-driven SELECT tag working for create and edit.
applying theme and some minor tweaks to fix a path error and an alignment issue

- theme "flatly" from http://bootswatch.com/2/flatly/
removing deleted file.
various fixes to auth-related code

- fixing the signup and signin controller code to not output a junk msg to user
- adding underscore lib for utility
- ading required to the signup form as appro
adding the flatly theme css file
changes to categories, underscore, logging, article removed

- removing the now-unused article model and controller
- adding categories as a top-level piece of data for the server-side and client-side
- removing local references to underscore in favor of one globally available instance
- adding winston logger as a globally available instance so I can log stuff when needed