Update one-jar-boot 0.97 to version 0.97.1

There is a more recent version of OneJar available at http://sourceforge.net/projects/one-jar/files/one-jar/one-jar-0.97.1/ than the one packaged with the gradle-one-jar plugin.

Unfortunately it has the same filename as the old JAR file but is more recent (2012-08-15) than the one packaged with this Gradle plugin (2011-05-05).