Merge pull request #2478 from pjackson28/v3.0

Form validation: Fixed invalid SCSS extend to a non-existent placeholder
Fixed margin-right-0 placeholder selector issues in form validation SCSS.
Merge pull request #2484 from EricDunsworth/v3.0-formvalid-error-margins

Fixed margin-right-0 placeholder selector issues in form validation SCSS.
Lightbox: Removed aria-haspopup and optimized loader.
Merge pull request #2487 from pjackson28/removelightboxhaspopup

Lightbox: Removed aria-haspopup and optimized loader
Lightbox: Corrected title object assignment and changed pe to _pe.
Changed dataTitle to title in title object assignment.
Updated the post build script to use wet-boew.github.io for examples
Lightbox: Removed duplicate dialog role.
Merge pull request #2497 from pjackson28/removeduplicatelightboxdialog

Lightbox: Removed duplicate dialog role
Merge pull request #2496 from LaurentGoderre/v3.0

Demos: Updated the post build script to use wet-boew.github.io for examples
Lightbox: Fixed WAI-ARIA usage to allow more natural keyboard navigation.