Fix text color for buttons in Top Bar

When a button is used inside Top Bar, the text color was always getting set to the link color. However, a better default would be to use the button-style mixin from buttons.scss in order to determine what the best text color would be.
Added radius class to Reveal

If you add a radius class to reveal, it will inherit from global-radius by default.
Revert "Added radius class to Reveal"

This reverts commit 7d867e1dd1568210f91e9f7f99c4965d2e4ac711.
Merge branch 'master' of https://github.com/zurb/foundation
Revert "changes to master"

This reverts commit 4ca53900427da1b71b033e65116c27ca2fb61fee.
Merge branch 'master' of https://github.com/joeworkman/foundation
Enable dropdown bounds check so it can be guaranteed to be visible when open.

Dropdown will try to honor chosen align setting, unless the resulting position makes part of the dropdown content to be outside of chosen bounds. In that case, the alignment will be automatically update to make the whole dropdown visible in the chosen bounds.
Bounds setting "window" will display the dropdown in the currently visible document area, ensuring the user does not need to scroll to see the dropdown.
Bounds setting "document" may force the user to scroll to see the dropdown.
Turn this behaviour off by setting the "bounds" setting to anything else than "window" or "document".
Typo fix
Fix computation error, add check for left and right dropdowns and introduce container bounds setting
Merge branch 'master' of https://github.com/zurb/foundation into PR-dropdown-fit-bounds
Multilevel offcanvas menu
Added .project to gitignore
Restored version to forked 5.2.1
Changed \t to 2 space chars
shorted names for Multilevel Offcanvas
Completely new and optimized algorithm for smart positioning based on preference arrays
Add missing $is-input argument

Fixes Sass compile errors if you've included $is-input in custom button classes with Foundation 5.2. Related to https://github.com/zurb/foundation/issues/4871
Merge branch 'master' of https://github.com/zurb/foundation
fix tab deep-linking
Add setting for last-child float direction