refactor object-ancestor-chain
rewrite branch visualization using SVG, update styles & media queries (to resize thumbnails), minor update gallery-item
update media queries for revision browser
move gallery-item widget into separate ns
enable gallery-info module for fallback, add item button config, update gallery-item fn to accept optional attribs & credits, add styles
update timeline-svg to not use hiccups due to FF/Safari incompatibility, update media queries