[css-scoping] Rename /deep/ to >>>, per WG resolution.
[css-scoping] Give an English name to the >>> combinator.
[css-align] Revert the swallowing of stretch by <item-position>, since combining it with <overflow-position> makes no sense.

--HG--
extra : rebase_source : 1bbc8427562798cf65e5f6e92baade7253335bbe
[selectors] Add >> form of descendant combinator per WG resolution <http://lists.w3.org/Archives/Public/www-style/2014Jun/0106.html>

--HG--
extra : rebase_source : f4471dd2ce2e6741dabe39ba54d3e72a63cf9f91