use new module ScrollMagick to export environment variables for the scrolls

Signed-off-by: Mattias Andrée <maandree@operamail.com>
use scrollmagick for executing scrolls

Signed-off-by: Mattias Andrée <maandree@operamail.com>
use scrollmagick in spikeless

Signed-off-by: Mattias Andrée <maandree@operamail.com>