Unified ABBR border.
Added lots of explanations to certain normalized declarations.
Improved invisible elements for screen readers.
Removed IE7 support from images.
Removed old Opera support.
Removed table cell padding.
Removed typographic classes.

Did not use them. :-(
Refactored form styles.
Refactored button styles.

Link button should use @extend if needed.
Removed embedding images hints from README file.

Oops, seems like I forgot that in eea433f.