PDI-10432 - pentaho-cassandra-plugin-1.0.0.zip has a spurious .gitignore in the .zip

Add defaultexcludes for ant < 1.8.2
Merge pull request #42 from pavel-sakun/PDI-10432

PDI-10432 - pentaho-cassandra-plugin-1.0.0.zip has a spurious .gitignore in the .zip