Version 6.x-2.2

- add extra comments in the master-css3.css file
- customize the edit tabs style
- Changes the default meta content-type tag to the shorter HTML5 version
- Changes the search form to use the HTML5 "search" input attribute
- change HTML tag for the sidebars to <aside> due to the new specs
- add a few CSS from normalize.css for some HTML5 tags
- change the message status and error style
- change the error input style