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.
- New sample content showing alternative approaches to custom tags wrapping
 their inline content:
http://borismoore.github.com/jsrender/demos/step-by-step/08_custom-tags.html.
- See also JsViews sample:
http://borismoore.github.com/jsviews/demos/tag-controls/tabs-control.html

Fix for #190