jQuery v1.8 compatibility

[barchard]

Hi-

As of version 1.8, Live Search is broken.

The error is here:
https://github.com/nakajima/jquery-livesearch/blob/master/src/jquery.livesearch.js#L5

To fix, please see:
http://stackoverflow.com/questions/2196641/how-do-i-make-jquery-contains-case-insensitive-including-jquery-1-8

Code:

jQuery.expr[":"].Contains = jQuery.expr.createPseudo(function(arg) {
    return function( elem ) {
        return jQuery(elem).text().toUpperCase().indexOf(arg.toUpperCase()) >= 0;
    };
});

To maintain 1.7 compatibility, I wrote a little if test using the jQuery version function here:
http://stackoverflow.com/questions/2655308/jquery-version-compatibility-detection/3113707#3113707

  /** jQuery < 1.8 */
  if ($.isVersion('1.8', '<'))
  {
      $.extend($.expr[':'], {
        'containsi': function(elem, i, match, array) {
          return $(elem).text().toLowerCase()
            .indexOf((match[3] || "").toLowerCase()) >= 0;
        }
      });
  } else
  {  
      /** jQuery > 1.8 */
      jQuery.expr[":"].containsi = jQuery.expr.createPseudo(function(arg) {
        return function( elem ) {
            return jQuery(elem).text().toUpperCase().indexOf(arg.toUpperCase()) >= 0;
        };
      });
  }

Of course, using the if statement is okay for my project but it may add unnecessary weight to the live search plugin.

-Greg