Start using cf-core, and other enhancements

Updates:

• Now uses cf-core which bundles some basic dependencies into one like Normalize, typography and utilities.
• Uses .u-clearfix instead of other weird tricks like padding 1px and overlfow hidden to clear floats.
• Reformats JS to use jQuery plugin syntax.
• Adds dynamic animation durations for expanding and collapsing.
• Converts anchor elements to button elements for accessibility.
• Reworks the documentation to make it easier to read and easier to find the recommended pattern.

Updates and pins some deps, cleans up some old files

Merge pull request #28 from himedlooff/gh-pages

Updates npm modules.

Easing

Adds the easeOutExpo easing function for the expand/collapse animation.

Miscellaneous updates

Updates some behind-the-scenes stuff. No user-facing changes.

Removes overflow hidden

Replaces overlfow hidden with padding 1px to stop margin collapses. This is safer than overflow hidden.

Adds new elements and aria attributes

• Adds
  • .expandable_label
  • .expandable_link
• Adds aria-controls to associate the trigger with the content.
• Adds aria-expandable to the content div.
• Updates docs

Major refactoring

• Refactored to use a BEM syntax
• Breaks the pattern down into a super simplified expandable pattern that can be the base for alternate custom expandable patterns
• Updates the default padded example pieces so that they can be rearranged if necessary

Browser testing

• Chrome (31)
• Safari (6,7)
• FF (28)
• IE11
• IE10
• IE9
• IE8
• IE7
  • Icons not working (this issue is already noted)
• Opera (12)
• iOS (6,7)
• Android (4.4,4.3)
• Blackberry Bold