[CSSWG][css-align] Updated WD of CSS Box Alignment Level 3

The CSS WG has published an updated Working Draft of
the CSS Box Alignment Module Level 3
     http://www.w3.org/TR/css-align-3/

This module defines new features relating to the alignment of
boxes within their containers in the various CSS box layout
models: block layout, table layout, flex layout, and grid layout.

This draft includes details on baseline alignment, and a small
pile of more minor fixes.

Significant changes are listed at:
   http://www.w3.org/TR/2014/WD-css-align-3-20141218/#changes

Please send any comments to this mailing list, <www-style@w3.org>, and
please, prefix the subject line with

     [css-align]

(as I did on this message).

For the CSS WG,
~fantasai