confusing code cleanup
add caching var for $ call
Upgrading modular vars for zero output

This will change the current behavior so that setting $include-html-classes: false; and $include-print-styles: false; will produce an empty css file.

This way users can add in only the pieces they want to include by setting: $include-html-classes: false; and $include-html-XYZ-classes: true;
Update _clearing.scss

When creating a clearing gallery using block-grid for presentation, some styles interfere with the presentation of clearing.
Example:

<ul class="large-block-grid-4 clearing-thumbs" data-clearing>
<li><a href="#" class="th"><img src="myimage.jpg"></a></li>
<li><a href="#" class="th"><img src="myimage.jpg"></a></li>
<li><a href="#" class="th"><img src="myimage.jpg"></a></li>
<li><a href="#" class="th"><img src="myimage.jpg"></a></li>
<li><a href="#" class="th"><img src="myimage.jpg"></a></li> <- This thumbnail will appear on second line
<li><a href="#" class="th"><img src="myimage.jpg"></a></li>
<li><a href="#" class="th"><img src="myimage.jpg"></a></li>
</ul>

The style for the block-grid break the presentation of the clearing thumbnails with this selector .large-block-grid-4 > li:nth-of-type(4n+1) because the fith thumbnail will be cleared and floated to the left.
Missing : in $topbar-media-query

Fixes an iPad landscape error, which didn't show topbar correct.
Nested side_nav items corrected styles

When nesting side_nav items (ul) only the direct first-child should get
a different style.
Changed font-smoothing to subpixel rendering

The antialiased mode is generally less good at rendering fine or sharp edged fonts than with subpixel rendering. (which is the default in webkit I think)
Introduced separate variable for custom form class generation
make custom form (checkbox, radio button) a little more customizable
Show DIVs for @media print

Don't remove all DIVs except .reveal-modal. Make .reveal-modal's
background white to aviod overlaying transparent DIVs
Remove fixed top bar bottom margin
Remove confusing "h1." from header example for h5 and h6.

Can't believe they are supposed to be there.
updated small/large-centered classes and added large-uncentered so people can keep centering only on small if they want
Added Foundationify Shopify theme link to readme.md
Merge branch 'modular-classes-upgrade' of github.com:ascottmccauley/foundation into ascottmccauley-modular-classes-upgrade
Merge branch 'master' of github.com:zurb/foundation
Merge pull request #2247 from shikolay/master

Micro cleanups
fixed conflict
Merge branch 'master' of github.com:zurb/foundation
Merge pull request #2271 from nrone/patch-1

Missing : in $topbar-media-query
Merge pull request #2273 from hphoeksma/nested-site-nav

Nested side_nav items corrected styles