Add an offset to Below the fold images

lib/tools/phantomas/custom_modules/modules/lazyLoadableYLT/lazyLoadableYLT.js

@@ -26,7 +26,9 @@ exports.module = function(phantomas) {
                     path,
                     processedImages = {},
                     src,
-                    viewportHeight = window.innerHeight;
+                    viewportHeight = window.innerHeight,
+                    // Add an offset of 100px under the height of the screen
+                    LAZYLOAD_OFFSET = 100;
 
                 phantomas.log('lazyLoadableImages: %d image(s) found, assuming %dpx offset to be the fold', len, viewportHeight);
 
@@ -64,7 +66,7 @@ exports.module = function(phantomas) {
                 Object.keys(processedImages).forEach(function(src) {
                     var img = processedImages[src];
 
-                    if (img.offset > viewportHeight) {
+                    if (img.offset > viewportHeight + LAZYLOAD_OFFSET) {
                         phantomas.log('lazyLoadableImages: <%s> image (%s) is below the fold (at %dpx)', src, img.path, img.offset);
 
                         phantomas.incrMetric('lazyLoadableImagesBelowTheFold');