Update _block-grid.scss

fix issue display list-style option
Reducing verbosity of comments, fixed a typo Line 551, adjusted the spacing before each setting so the document is easier to scan.
Fix for clearing thumbs layout #2068

Bug demonstrated here:
http://lukebussey.com/foundation-clearing-bug/

Fix demonstrated here:
http://lukebussey.com/foundation-clearing-fix/
Updating _clearing.scss styles to match that of docs.scss and removed code from docs.scss
Added glowing effect option for inputs
Merge branch 'master' of https://github.com/zurb/foundation
Added glowing effect mixin
Orbit bullet color variables fix

$orbit-bullet-nav-color and $orbit-bullet-nav-color-active we're not
used anywhere so I applied them to the orbit bullets which I'm assuming
they were for.
Normalize file input width to 100% to prevent overflow on mobile layouts.
Update dropdown positioning calculations based on offsetParent.
Check if clearing event target is link or image.
Bump Clearing to 4.1.3
updated dead link
updated html file reference on getting started page
added article for multiple dependencies
Update sections docs to include reflow explanaction.
Merge branch 'master' of github.com:zurb/foundation
Added dropdownHeight variable from the to-be-seen dropown to apply as min-height to .top-bar
Nested section updates to js.
updated nested section code styles