Sets up basic template and styling to be used across the site

Highlights:

* Introduces twitter bootstrap for scaffolding and consistent styling using the
bootstrap-sass gem
* Uses sass as a css preprocessor to give better ability to set css
variables, mixins, nesting, etc. - all style classes should have
file extension of .css.scss
* Uses haml instead of erb to do template rendering because of its
terseness...both can live in the same app, but you'll want to just one or the
other going forward for consistency's sake
* Creates a application layout that gives the template for all pages
that users will see (who are logged in)
* Creates a welcome layout for the template used on non-logged in users
pages
* Introduces simple_form gem for creating forms - this will become more
valuable as the forms become more complex
* The welcome page has a banner with login form, a area for marketing,
and a signup form
* The logged in user home page has a welcome banner, and a list of
departments/schools, the latter is shared with the departments list page.

Todo:

* Set up a user system with devise or warden, and in the
config/routes.rb file, uncomment the filter that sends a user to
either welcome or home controller depending on logged in user status
* Hook in the forms to actually do stuff
* The nav links on the left do not update based on what page you're on
* You'll probably want to introduce a flash area in your application
layout to use for showing notifications to users on a page
* Finish filling in the rest of the pages obviously

Good luck and feel free to ask questions!