[css-flexbox] Switch back to mentioning 'elements' when computing 'align-self'.
merge
[css-flexbox] Update issues list
[css-flexbox] Ugh, resolve conflict.
[css-values] Revert change adding <ident>.

--HG--
extra : rebase_source : 43ef3c69cbbc55eec2eed211d8505e51ad4b91eb
[css-variables] Use <custom-ident>.

--HG--
extra : rebase_source : 1a080cc76360405b9124f70ea729b2f19823b461
[css-variables] bikeshed fixes
[css-display] Add ruby values.
[css-display] Add the keywords to the propdef tables, too.
[css-display] Removed issue about 'display: inline-level block;'.
[css-display] Remove issue about changing initial values. Remove incorrect note about redundant expansions.
[css-display] Add some dfns.