Added multi_expand option for accordion

Updated section configuration documentation
Added stopPropagation to prevent duplicate click events.
Fixed loading of data-options overrides in resize function
Check if nav has the sticky class before adding or removing it. Not checking causes severe framerate drops as addClass was called continuously during page scroll.
Merge pull request #3059 from olafurnielsen/master

Check if sticky nav has the fixed class before adding or removing it.
Made  display: block important. Fixes issue with using jquery show on error labels.
Merge pull request #3093 from VoiceOfWisdom/important-error

Made  display: block important. Fixes issue with using jquery show on error messages
Callout panel links to be white in color
Changed variable name to be more precise
variable name change
Closing Dropdown when a Reveal link is clicked
Toggle menu when a Reveal link is launched
Optinal dropdown for Top Bar
Update documentation, variables.scss and add inline comment
-side-margin standardize between docs and _type file
Merge pull request #3088 from seantimm/issue-3088

Dropdown/Reveal Bug
Merge pull request #3083 from seantimm/issue-3083

Reveal z-index conflict with opened top-bar menu on iPhone
Merge pull request #3055 from mmikitka/section_fix_loading_of_settings_on_resize

Fixed loading of data-options overrides in resize function
Merge branch 'master' of https://github.com/zurb/foundation
Fixed unit issue in top_bar