generate api index page

scripts/docs/templates/api_version_select.template.html

@@ -0,0 +1,11 @@
+<select onchange="window.location.href=this.options[this.selectedIndex].value">
+<@ for ver in version.list @>
+  <option
+   value="<$ ver.href $>/{% if page.path != ''%}{{page.path}}{% else %}api/{% endif %}"
+   {% if page.version == "<$ ver.name $>"%}selected{% endif %}>
+    <$ ver.name $> <@ if version.latest.name == ver.name @>(latest)<@ endif @>
+  </option>
+<@ endfor @>
+</select>
+
+