Fixed malformed Data URI

Removed a space from a URL in the form-select mixin that was causing
Ruby's URI.parse method to throw an error. Can't 100% guarantee that
spaces in data URIs are actually against spec, but my reading of RFC
2397 suggests they aren't, and it'll decode the same without the space
anyway.

Ran into the issue when using a gem (sinatra-assetpack) that attempts to
parse URLs in CSS to see if they can be "cache busted".
test travis
Add support for table caption

Provides styling of table caption element
Provides more configuration of side nav

Adds a few more variables to configure headings and link hover background
Merge pull request #8 from zurb/master

Update Foundation
Update _offcanvas.scss
Merge pull request #9 from zurb/master

Update Foundation
Create mixin for hamburger icon
Check if mixin is being used in offcanvas
Update _offcanvas.scss
Check if mixin is being used in offcanvas
Update _top-bar.scss
Update _top-bar.scss
Update _top-bar.scss
Update _top-bar.scss
Update _top-bar.scss
Allow false to be passed as abort_on_close option

Before as it was only looking to see if the abort var was defined or not you were unable to set the abort_on_close option to false and have the post callbacks trigger.
Update equalizer.html
js init function updated
Changed font weight definitions to variables.