Update batik to 1.8-prerelease (see #11438)

This PR updates batik to a trunk revision. It has been built locally using Oracle JDK 1.6 (see commit comment).
This should fix the deprecation of com.sun.image.codec.jpeg.JPEGCodec (http://www.oracle.com/technetwork/java/javase/compatibility-417013.html#incompatibilities) in JDK 1.7/OpenJDK 1.7. This PR has been tested on Oracle JRE 6/7 (OS X) and OpenJDK 6/7 (Ubuntu).

To test, run ``py.test test/integration/test_bfpixelsstoreexternal.py`` and ``py.test test/integration/test_bfpixelsstoreinternal.py``. Both should pass. Also verify that in Insight a "clock" icon appears for images for which pyramids are being generated.