fix calls to each() method

Author: dryabov

src/jquery.lazyloadxt.js

@@ -106,7 +106,7 @@
             elementOptionsOverrides[prop] = getOrDef(overrides, prop);
         }
 
-        return this.each(function (el) {
+        return this.each(function (index, el) {
             if (el === window) {
                 $(options.selector).lazyLoadXT(overrides);
             } else {

src/jquery.lazyloadxt.picture.js

@@ -18,7 +18,7 @@
         if (matchMedia) {
             $el
                 .children('br')
-                .each(function (el) {
+                .each(function (index, el) {
                     var $child = $(el),
                         source = isFuncSrcAttr ? srcAttr($child) : $child.attr(srcAttr),
                         media = $child.attr('media');

src/jquery.lazyloadxt.script.js

@@ -26,7 +26,7 @@
             srcAttr = 'data-src';
         }
 
-        $('br[' + dataLazyTag + '],span[' + dataLazyTag + ']').each(function (origElem) {
+        $('br[' + dataLazyTag + '],span[' + dataLazyTag + ']').each(function (index, origElem) {
             var attrs = origElem.attributes,
                 el = document.createElement($(origElem).attr(dataLazyTag)),
                 i;

src/jquery.lazyloadxt.video.js

@@ -16,7 +16,7 @@
         $el
             .attr('poster', $el.attr(options.videoPoster))
             .children('source,track')
-            .each(function (el) {
+            .each(function (index, el) {
                 var $child = $(el);
                 $child.attr('src', isFuncSrcAttr ? srcAttr($child) : $child.attr(srcAttr));
             });