Update flyout menu scripts - Superfish

Update Superfish to 1.7.4
Remove hoverIntent in favor of loading from WP-core
Remove deprecated Supersubs script
Define focus style for styling menu links when tabbing through menu
Cleaned up and updated the readme.html.
Merge pull request #87 from SeamlessThemes/patch-1

Cleaned up and updated the readme.html.
Specify type hierarchy - small text should be 12px or 14px

Props SeamlessThemes
Make middle column 52% in three-column-layout

Props SeamlessThemes
Remove reference to .ie7 class in .sf-menu styling

Props SeamlessThemes
Merge pull request #73 from ThematicTheme/feature/update-superfish

Update superfish menu scripts
Merge branch 'develop' into feature/mobile-navigation

Conflicts:
	library/css/style1.css