add bootstrap, top-menu, span and footer

add bootstrap:
打开项目中conf/BuildConfig，在runtime中增加[runtime
":twitter-bootstrap:2.2.2"]插件依赖，
>$grails compile

add top-menu in header.gsp based on
http://www.bootcss.com/examples/hero.html and
http://www.ycpai.com/home

add span9 and span3 in body

add footer in footer.gsp