Teach jericho extractor srcset

modules/src/main/java/org/archive/modules/extractor/JerichoExtractorHTML.java

@@ -196,6 +196,13 @@ public class JerichoExtractorHTML extends ExtractorHTML {
 
             processEmbed(curi, attrValue, context, hopType);
         }
+        // SRCSET
+        if (((attr = attributes.get("srcset")) != null) &&
+                ((attrValue = attr.getValue()) != null)) {
+            codebase = StringEscapeUtils.unescapeHtml(attrValue);
+            CharSequence context = elementContext(elementName, attr.getKey());
+            processEmbed(curi, codebase, context);
+        }
         // CODEBASE
         if (((attr = attributes.get("codebase")) != null) &&
                  ((attrValue = attr.getValue()) != null)) {

modules/src/test/java/org/archive/modules/extractor/JerichoExtractorHTMLTest.java

@@ -151,15 +151,6 @@ public class JerichoExtractorHTMLTest extends ExtractorHTMLTest {
     @Override
     public void testConditionalComment1() throws URIException {
     }
-    
-    /*
-     * Override of ExtractorHTMLTest method because the test fails with
-     * JerichoExtractorHTML
-     */
-    @Override
-    public void testImgSrcSetAttribute() throws URIException {
-        // jericho parser doesn't understand srcset
-    }
 
     /*
      * Override of ExtractorHTMLTest method because the test fails with