Commit 28. Small design change for custom tags with declared templates.
- A declared template now takes precendence over inline (block) content,
 but can access the inline content using {{include tmpl=#content/}}, or
 programmatically as tagCtx.content.
- Updated sample:
http://borismoore.github.com/jsviews/demos/tag-controls/tabs-control.html
- See also updated JsRender sample:
http://borismoore.github.com/jsrender/demos/step-by-step/08_custom-tags.html.