Content changes to Design guide
Merge pull request #1073 from cfarquharson/master

More updated content for Design guide
Added :visited style (stops .ui-link:visited override)
Fixed RTL module-comment icon
Merge pull request #1076 from patheard/sidenav-visited

Added :visited style (stops .ui-link:visited override)
Fixed :visited link style for content links (#wb-main-in)
Merge pull request #1078 from atlantiswebconsulting/master

Fixed RTL module-comment icon
Merge pull request #1079 from patheard/visited-links

Fixed :visited link style for content links (#wb-main-in)
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