Fix #83, spacing is reduced between two consecutive headings

Author: azerupi

src/theme/book.css

@@ -16,6 +16,15 @@ h2,
 h3 {
   margin-top: 2.5em;
 }
+h4,
+h5 {
+  margin-top: 2em;
+}
+.header + .header h3,
+.header + .header h4,
+.header + .header h5 {
+  margin-top: 1em;
+}
 .sidebar {
   position: absolute;
   left: 0;

src/theme/book.js

@@ -33,7 +33,7 @@ $( document ).ready(function() {
 
     // Add anchors for all content headers
     content.find("h1, h2, h3, h4, h5").wrap(function(){
-        var wrapper = $("<a>");
+        var wrapper = $("<a class=\"header\">");
         wrapper.attr("name", $(this).text());
         return wrapper;
     });

src/theme/stylus/general.styl

@@ -16,3 +16,6 @@ html, body {
 }
 
 h2, h3 { margin-top: 2.5em }
+h4, h5 { margin-top: 2em }
+
+.header + .header h3, .header + .header h4, .header + .header h5 { margin-top: 1em }