More tests.

imageio/imageio-core/src/main/java/com/twelvemonkeys/imageio/ImageReaderBase.java

@@ -354,6 +354,10 @@ public abstract class ImageReaderBase extends ImageReader {
             Thread.currentThread().interrupt();
         }
         catch (InvocationTargetException e) {
+            if (e.getCause() instanceof RuntimeException) {
+                throw (RuntimeException) e.getCause();
+            }
+
             throw new RuntimeException(e);
         }
     }

imageio/imageio-core/src/main/java/com/twelvemonkeys/imageio/util/IIOUtil.java

@@ -57,6 +57,9 @@ public final class IIOUtil {
 
     /**
      * Creates an {@code OutputStream} adapter that writes to an underlying {@code ImageOutputStream}.
+     * <p/>
+     * Note: The adapter is buffered, and <em>MUST</em> be properly flushed/closed after use,
+     * otherwise data may be lost.
      *
      * @param pStream the stream to write to.
      * @return an {@code OutputSteam} writing to {@code pStream}.