bug 1071025 - save button not showing for classifying

* the grunt minification couldn't handle the html as it was with a trailing slash on the ``<textarea/>`` element.  fixed the html.
* Also made the grunt minification not outright fail on this type of issue.  with ``keepClosingSlash`` set to true, the HTML would have been valid, but not minified as much.  So the HTML change is still good so that it minifies as much as possible.

``htmlmin`` has a ``lint`` feature, but that wasn't working for me, so I didn't include it.  It seemed to fail in an inexplicable place.  It may not work well with the way we do templates.