Changes to base.html template and sfm.css to address diplay issues

This should do it. You can see it here: http://gwdroid.wrlc.org/~aldridge/libheader/sfm_test.html

You have some IE8 issues with the d3 chart and the header (which is strange, my sample/test libsite bootswatch page displays fine in IE7-8 http://gwdroid.wrlc.org/~aldridge/libheader/bootswatch.html)

I'll merge some of the css into the libsite bootswatch css.