Fix #1459 / Position adjustment

Add an offset setting for position adjustment (https://github.com/zurb/joyride/commit/9947443e1ceafa623fece4c74eefa9b87c474cd5)
Added open_selectors option to settings, and updated the documentation.
Removed debugging statements.
Update foundation.dropdown.js

Centered the dropdown with it's parent, and the pip with the dropdown. Both are now responsive to shifting page sizes.
Add a setting for top bar hover (Part 2)

2nd part of :
https://github.com/zurb/foundation/pull/5087
Adjustments to fix the navigation if additional elements are added to the template.
Merge branch 'patch-2' of github.com:webmasterlpo/foundation into webmasterlpo-patch-2
Merge branch 'webmasterlpo-patch-2'
Merge branch 'master' of github.com:kpkeenan/foundation into kpkeenan-master
Merge branch 'kpkeenan-master'
Merge branch 'clearing-open-selector' of github.com:asommer70/foundation into asommer70-clearing-open-selector
Merge branch 'asommer70-clearing-open-selector'
Merge branch 'patch-1' of github.com:glafarge/foundation into glafarge-patch-1
Merge branch 'glafarge-patch-1'
Fix for -link-bg-color-hover color - with updated docs
Fix link
Fix #4921, proper use of the $tabbar-line-height variable