IE10 Supports Number Inputs

Their [documentation on MSDN](http://msdn.microsoft.com/en-us/library/ie/hh773064(v=vs.85).aspx) isn't a superb witness to this, but the control is in the browser (sans spinners, but I see no indication these are a requirement).

You can test this various ways: 1) Retention of the "number" value for the element.type, and 2) Removal of any non-numberical characters in the element.value property.
Updating Notes Re: IE10 UI

Internet Explorer 10, while supporting the input type of number, does not render increment/decrement controls on the input element.
Merge pull request #173 from jonathansampson/patch-1

IE10 Supports Number Inputs