Mayo now has a default Main menu like Bartik to give a starter menu that's responsive on all devices. Changes were made to make it compatible with the Superfish module that many Mayo users have counted on in the past.
See Mayo theme - Moderately Critical - Cross Site Scripting (XSS) - SA-CONTRIB-2015-164
Removed admin settings for margins associated with logo, site name, and slogan to fix #2550593. Positioned with padding in styles.css
Issue #2509832 by Reg: Notice: Array to string conversion in mayo_get_plugins() (line 34 of .../mayo/inc/plugins.inc)
array_unique error corrected.
Improved styling for tabs.
Add feature to display breadcrumb Bartik style.
Fix for dark message setting #2261491 by rhouse.
Update .info description.
Corrected site-name font-size problem reported in #2272945 by rhouse.
Allow multi-tabs to wrap. patch #2278041 by rhouse.
Rounded corners miss-labeled corrected.
Padding conflicts and box-sizing.
The same basic MAYO except that this version makes it responsive along with the settings needed to set layout for Big screen, Small screen touch, and Tablet devices.
This version also reverts back to the old style search input form.
Increased support for Superfish menus as they are much improved for responsive designs.
Uses SASS but not a problem when using a sub-theme.
HTML5 used but didn't go as far as it could have with semantic markup. It's a good start.
A couple of bug fixes and a revision of the way Page Width is handled in theme settings. Removed the Page Width setting in "Layout Settings" in favor of the responsive Page Width settings associated with each device type.
This release adds mobile first responsive layout features to Mayo. It does not have an option to disable responsive so those not wanting to use responsive features should stick with 7.x-1.x versions of Mayo.
#1012758 by JohnnyX - additional regions (top block columns and bottom block columns)
#1012756 by JohnnyX - improved user picture positioning
#1012844 by JohnnyX - Comments and forum topics more clearly represented..
#1012536 by JimmyAx - improved dt dd tag handling
#1012278 by JimmyAx - fixed duplicate IDs - invalid XHTML