Add a documentation macro for marking version numbers

By signalling features that are new in 5.1.14 we can include
documentation updates for the new version when we build updates to
5.1.13

editions/tw5.com/tiddlers/system/doc-styles.tid

@@ -161,3 +161,11 @@ tr.doc-table-subheading {
 .doc-block-icon .tc-image-warning {
 	fill: <<colour alert-highlight>>;
 }
+
+.doc-from-version {
+	display: inline-block;
+	border: 2px solid <<colour alert-border>>;
+	border-radius: 0.5em;
+	background: <<colour alert-background>>;
+    padding: 0 0.4em;
+}

editions/tw5.com/tiddlers/system/version-macros.tid

@@ -0,0 +1,8 @@
+created: 20161008085627406
+modified: 20161008085627406
+title: $:/editions/tw5.com/version-macros
+tags: $:/tags/Macro
+
+\define .from-version(version)
+<span class="doc-from-version">New in $version$</span>
+\end