Indent blockquotes

Ideally we'd also put a line on the left to more clearly mark it as a
blockquote, but this will at least make it easier to distinguish
blockquotes from other text.

Author: aykevl

css/epub.css

@@ -29,6 +29,10 @@ h4, p, blockquote, dl {
 	margin: 1.12em 0;
 }
 
+blockquote {
+	margin-left: 1em;
+}
+
 h5 {
 	font-size: 0.83em;
 	margin: 1.5em 0;