Twenty Fifteen: better editor-style.css: slightly smaller fonts, make the body margins relative, fix dependency on the `mce-item-table` class for tables. Props iamtakashi, fixes #29986
Built from https://develop.svn.wordpress.org/trunk@29987


git-svn-id: http://core.svn.wordpress.org/trunk@29729 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fifteen: Fix missing commas in the stylesheet.

props iamtakashi.
fixes #30068.
Built from https://develop.svn.wordpress.org/trunk@29988


git-svn-id: http://core.svn.wordpress.org/trunk@29730 1a063a9b-81f0-0310-95a4-ce76da25c4cd