Fixed focus management with reduceMotion

Removed forgotten console.log()

fix special characters bug

If reduce motion is enabled, still include header offset in anchor jump

Fixed error when disabling scroll to the top

Cancel scroll if default event is prevented elsewhere

Added detection for shift + click

Fix pageYOffset bug: #457

Added autopublishing to NPM

Fixes #454. When speed is `0`, Nan/Infinity value was breaking calcul…

…ations. This forces the number to 0 in those situations.