Merge branch 'hotfix/2.6.3'
Syntax correction for border-radius
Utilise $header-link-hover-color
Merge branch 'develop' of https://github.com/GumbyFramework/Gumby

# By Adam Chambers (4) and others
# Via Adam Chambers
* 'develop' of https://github.com/GumbyFramework/Gumby:
  Bump bower.json version number
  Note regarding changelog in README
  Compile Gumby JS
  Compile Sass
  Update _entypo.scss
  Update README.md
  Update gumby.tabs.js