Fix tags screwing up the layout below

Because they float they would screw up the element following them.

go/blog/blog.go

@@ -42,6 +42,7 @@ var dataPath string = "blog.yaml"
var defaultStyle = `
article {
	margin-bottom: 2em;
	clear: left;
}
article header {
@@ -98,6 +99,7 @@ article.does-not-match {
	color: #555;
	font-size: smaller;
	margin-bottom: 1em;
	clear: left;
}
`