Addition of an extra reference link

Addition of an extra reference link
minor edit of spelling mistake

minor edit of spelling mistake
separated disabled button scss for IE8

separated disabled button scss for IE8
Merge pull request #1036 from cfarquharson/master

Design Guide: minor edit of spelling mistake and added a reference link
Merge pull request #1037 from cfarquharson/v3.0

Separated disabled selector button SCSS for IE8 pseudo bug (Fixes #1033)
Fixed GCWU wavy background in IE7 and IE8.
Merge branch 'v3.0' of github.com:wet-boew/wet-boew into v3.0
Merge branch 'v3.0'
Merge branch 'master' into experimental