Enhanced contact form with jQuery

Also tinified pngs
Fixed PHP validation, improved slider code.
Added waypoints.
Changed to skrollr library
Revert "Changed to skrollr library"

This reverts commit 2acaa6b836b35614505bb5ee2f44e6a20cd262bd.
Revert "Revert "Changed to skrollr library""

This reverts commit 48da52020db59b9392dca82d43bb5ffb5ca8754d.
Revert "Changed to skrollr library"

This reverts commit 2acaa6b836b35614505bb5ee2f44e6a20cd262bd.
Reverted back to original code because skrollr is too buggy