Added option 'exposeAddClass'

Adding option 'exposeAddClass' adds extra class to exposed element. This fixes a problem with exposing elements with no background(-color).
Handle elements with no classes correctly
making sure to return function object
update manist to create normalize properly
Merge branch 'master' of github.com:zurb/foundation
Renaming parameter name from char to character

Some minifieng engines can not work due to char is an reserved word.
Merge pull request #2322 from alebon/master

Minifier optimization
updated top-bar variables and fixed a few style issues with dropdown arros and bg colors. Closes #2312
updated custom form checkbox character. Reverted back to original character because recent PR had some weird rendering issues.
updated comments for visibility classes to be accurate. closes #2320
updated topbar sticky class with variable
updated _variables.scss
updated media query variables to use px for more consistent performance
Mislabeled .row.collapse code example
Merge pull request #2324 from pmeissner/patch-2

Mislabeled .row.collapse code example
Change title select height calculation in section.js
Fix deep linking for sections in jquery.
Merge pull request #2315 from beatak/avoid_poltergeist_error

making sure to return function object
Fix animation on video.
Merge branch 'master' of github.com:zurb/foundation