rev PointerGestures & build
ShadowDOMPolyfill +MDV test for distribution of template stamping
update PointerGestures, freshen build
freshen ShadowDOM, HTMLImports and builds.
fix depedency lists
add code to inject stylesheet for <template> hiding
add custom-element-patches to modify Observation functionality for compatibility with ShadowDOMPolyfill
fix depedency lists
update test and smokeTest files
freshen CustomElements
merge from master