• Updated mouse input to always be relative to the window rather than the page using event.client[X|Y] rather than event.page[X|Y].
• Added relativeInput behaviour to switch the mouse input coordinate system to the element passed to the Parallax constructor. See README for details.
• Added clipRelativeInput behaviour to limit the mouse input influence to the bounds of the element passed to the Parallax constructor. See README for details.
• Created a new example: relative.html to demonstrate this new functionality.