fix strict mode error in Safari - Merge pull request #64 from 3kthor3adward/master

fix strict mode error in Safari - http://eslint.org/docs/rules/no-inner-declarations
Thanks @3kthor3adward

Author: Sathvik Ponangi

jQuery.print.js

@@ -31,7 +31,7 @@
             wdoc.write(content);
             wdoc.close();
             var printed = false;
-            function callPrint() {
+            var callPrint = function () {
                 if(printed) {
                     return;
                 }