Updated bootstrap on the main page.

I took the nav bar out of the main_page.html and added it to the base.html.  I also added a navbar.css file to overrride the bootstrap; this made the nav bar be navy blue with yellow hover text.

I then had to make a static folder to hole the css files.  While there, I added some blank colored images (blue, pink, green, and orange all 1600x500px) to use a placeholders in the carousel.  I want to eventually take these out and add photos of the school.  These will do for now.

I also adjusted the colors of the search button to match the nav bars.  I also added radio buttons so that the user can choose either building, professor, or parking lots.