Add support for IE9

IE10 & IE9 works fine.
add basic keyboard navigation support
define custom events before and after page switch animations
Fixed a few missing semi-colons
Added Navigation functions and change in quietPeriod logic
Updated README to include navigation functions
adding an 'activated' event triggered when a section comes into view
Touch tap support

Added tap support with touch so that links/input works now on touch
devices. Added setting variable quietPeriod that allows user to change
how long scroll/swipe events are ignored during animations
Added an IE8 fix

This little fix makes the script work in Internet Explorer 8.
Merge branch 'patch-1' of http://github.com/sergejmueller/onepage-scroll
Applying pull-request #12
Applying pull-request #16
Applying pull-request #21
Applying pull-request #24