[css-values] Relax unnecessary restrictions on <custom-ident> per <http://lists.w3.org/Archives/Public/www-style/2014Mar/0120.html>.
[css-namespaces] Add wqwname production and changes list
[css-values] Update Changes section
[css-values] Clarify relative URL handling for embedded style sheets.
[css-values] Better wording for base url stuff.
[css-values] Better wording for base url stuff II