Update jquery.numeric.js

IE 11 support.
document.selection is no longer supported in IE 11 (http://msdn.microsoft.com/en-us/library/ie/ms535869%28v=vs.85%29.aspx).
Merge pull request #1 from JesLabs/patch-1

Update jquery.numeric.js
Fix IE11 issues in getSelectionEnd() and getSelectionStart()