BOOTSTRAP and some pretty stuff added
 Changes to be committed:
	modified:   school-dao/src/main/resources/META-INF/persistence.xml
	modified:   school-dao/src/test/resources/META-INF/db.config.properties
	modified:   school-dao/src/test/resources/META-INF/persistence.xml
	modified:   school-web/src/main/webapp/WEB-INF/tiles.xml
	modified:   school-web/src/main/webapp/WEB-INF/web.xml
	new file:   school-web/src/main/webapp/css/main.css
	new file:   school-web/src/main/webapp/img/crumbs.png
	new file:   school-web/src/main/webapp/img/crumbs_logo.png
	new file:   school-web/src/main/webapp/img/logo.png
	modified:   school-web/src/main/webapp/index.jsp
	modified:   school-web/src/main/webapp/views/home/home.jsp
	modified:   school-web/src/main/webapp/views/layout.jsp
	modified:   school-web/src/main/webapp/views/tiles/header.jsp
	new file:   school-web/src/main/webapp/views/tiles/main_content.jsp
	modified:   school-web/src/main/webapp/views/tiles/sidebar.jsp