add icon to close #1

looks like this:

![](http://cl.ly/image/0D090Y0w2o16/Screen%20Shot%202014-07-30%20at%205.07.34%20PM.png)

i can't say i really like it... doesn't fit in with the others at all

source http://www.aanda.org/articles/aa/full/2002/29/aa2221/aa2221.right.html

direct http://www.aanda.org/articles/aa/full/2002/29/aa2221/img22.gif