Improve conciseness/clarity of ReplayInputStream/ReplayCharSequence usage/cleanup

* ReplayCharSequence.java
    implement Closeable
* ArchiveUtils.java
    (closeQuietly) for ReplayCharSequence 
* ExtractorCSS.java, ExtractorDOC.java, ExtractorHTML.java, ExtractorJS.java, ExtractorXML.java, HTTPContentDigest.java, CrawlServer.java, MirrorWriterProcessor.java, WARCWriterProcessor.java
    cover more with finally blocks; use closeQuietly() variants

commons/src/main/java/org/archive/io/ReplayCharSequence.java

@@ -22,6 +22,7 @@
  */
 package org.archive.io;
 
+import java.io.Closeable;
 import java.io.IOException;
 
 
@@ -34,7 +35,7 @@ import java.io.IOException;
  * @author stack
  * @version $Revision$, $Date$
  */
-public interface ReplayCharSequence extends CharSequence {
+public interface ReplayCharSequence extends CharSequence, Closeable {
 
     /**
      * Call this method when done so implementation has chance to clean up

commons/src/main/java/org/archive/util/ArchiveUtils.java

@@ -20,6 +20,7 @@
 package org.archive.util;
 
 import java.io.BufferedReader;
+import java.io.Closeable;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
@@ -895,5 +896,15 @@ public class ArchiveUtils {
     public static boolean isTld(String dom) {
         return TLDS.contains(dom.toUpperCase());
     }
+    
+    public static void closeQuietly(Closeable input) {
+        try {
+            if (input != null) {
+                input.close();
+            }
+        } catch (IOException ioe) {
+            // ignore
+        }
+    }
 }