add open and close glyph spans to hnv.hbs; add styling to humon node .css; centers around adding padding to bottom of collection divs but not if it's the last child
whitespace cleanups; phase out Em.assert on dC.commitVal for nonliterals; minor styling changes
fix bug in bubbling: hn.hasChildren wasn't updating when child elements were deleting so next/prevNode were failing
add dc.focusProxyFIeld and switch commitAndContinue for proxyField to insertChild (temporary way to add children to an empty collection)
merging hn changes