Updating banner

The banner is updated per #12.

modified:   _includes/banner.html
renamed:    index.html -> about-us.html
modified:   contact.html
renamed:    blog.html -> index.html
new file:   prospective-student.html
modified:   about-us.html
rewrite templates for bootstrap3
A simplified version of the blog using bootstrap3.

modified:   _includes/banner.html
modified:   _includes/footer.html
modified:   _includes/header.html
modified:   _includes/javascript.html
modified:   _layouts/default.html
new file:   _layouts/info.html
modified:   _layouts/people.html
modified:   _layouts/post.html
modified:   about-us.html
modified:   contact.html
new file:   css/blog.css
modified:   index.html
modified:   people/index.html
modified:   prospective-student.html
modified:   research.html