Update _settings.scss

_settings.scss needs some love. I've created a table of contents, given the code some heirarchy, and added a colors section. I'd love to see this update make it into Foundation or something like it!
doc pages offcanvas toggle anchor requires href

 Updated offcanvas examples to include href attribute on toggle anchors.

 The offcanvas toggle anchors require an href attribute to work properly
 on iphones as discussed here
 http://foundation.zurb.com/forum/posts/1651-cant-get-off-canvas-to-toggle-on-mobile
Use correct 'this' when setting data-interchange-last-path.

Because the 'this' being used was for the wrong scope
data-interchange-last-path is not set. This can lead to making multiple
requests for the same content unnecessarily.
Revert PR #5173 to restore JS functionality to IE 9.
Add $medium-up sizes for h5 and h6

With the new $h[1-6]-font-reduction in place, h5 and h6 need sizes set for $medium-up.
Update _settings.scss
update for changelog 5.2.3
Remove empty directories via gitignore
media-queries.html: fix typo: xlarge => xxlarge
Bump version to 5.2.3
Merge branch '5.3-wip'
Add comma support for Abide number validation
Fix URL in changelog

An extra bracket had appeared, meaning the Markdown was unable to be converted to HTML properly.
Merge pull request #12 from zurb/master

Update Foundation
Merge pull request #13 from winghouchan/master

Update Foundation
Fix typos

Fixes #5236
Period to colon
Typos
Typos
Presentation