Markdown table column alignment #1050

The alignment information were already in the generated html.
The css was the only thing missing, so I added it.

css/theme/template/theme.scss

@@ -199,6 +199,16 @@ body {
 	border-bottom: 1px solid;
 }
 
+.reveal table th[align="center"],
+.reveal table td[align="center"] {
+	text-align: center;
+}
+
+.reveal table th[align="right"],
+.reveal table td[align="right"] {
+	text-align: right;
+}
+
 .reveal table tr:last-child td {
     border-bottom: none;
 }