css/bootstrap.css :: added bootstrap css file.
images :: added graphics for new layout.
css/styles.css :: added styles for new layout.
index.xhtml :: updated the default home page (login) with new styles.
admin/index.xhtml :: added new layout styles to the admin hone page.
student/index.xhtml :: added new layout styles to the student hone page.
teacher/index.xhtml :: added new layout styles to the teacher hone page.