Add support for closing Sockets (could be removed if we switched to Java7)

Change-Id: I34aa3a772f7f777aa31ca6a243ad51bdc86fbb8e
Reviewed-on: http://gerrit.dmdirc.com/2462
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Chris Smith <chris@dmdirc.com>

src/com/dmdirc/util/io/StreamUtils.java

 
 import java.io.Closeable;
 import java.io.IOException;
+import java.net.Socket;
 
 /**
  * Utilities for dealing with streams.
         }
     }
 
+    /**
+     * Closes the stream if it is non-null, and ignores any IOExceptions
+     * raised by doing so.
+     *
+     * @param stream The stream to be closed
+     */
+    public static void close(final Socket stream) {
+        if (stream != null) {
+            try {
+                stream.close();
+            } catch (IOException ex) {
+                // Do nothing. We don't care.
+            }
+        }
+    }
+
 }