Clean up testbin during `ant clean`
Clean up testbin during `ant clean`

Otherwise tests that have been deleted will continue to fail.

mpujari/ohcount4j,mpujari/ohcount4j,blackducksoftware/ohcount4j,blackducksoftware/ohcount4j,mpujari/ohcount4j,mpujari/ohcount4j,blackducksoftware/ohcount4j,mpujari/ohcount4j,blackducksoftware/ohcount4j,mpujari/ohcount4j,blackducksoftware/ohcount4j