Issue #2120355 by Andreas Kohlbecker and JohnAlbin: Images width auto for IE8 cause images to ignore width and height put in markup
Issue #1638036 by JohnAlbin: Make visually-hidden component match Drupal 8's
Update CSS and style guide.
Issue #2052295: Add first/second left sidebar layout.
Issue #2052295: Remove region--sidebar.tpl.php.
Use main element in page.tpl.
Issue #2052295: Upgrade to Zen Grids 2.x
Update code comment.
Add SVG icons for front-end-facing components.
Fix messages handlebars file.
Update inline-image to better apply to core fields and fences fields.
More component clean up.
Use highlight-mark class in theme_mark().
Make non-core messages statuses get the default status styling.
Remove support for IE 6 and IE 7.
Issue #2497005: Make $zen-reverse-all-floats comment easier to understand.
Issue #2556761 by zxaos: Remove deprecated chrome-frame support
Merge branch 7.x-5.x into 7.x-6.x
Issue #2448097 by mvdve and JohnAlbin: panels-pane TPL hardcores H2 tag for every pane label
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