using apache commons to safely remove directory; previous version was unsafe
diff --git a/hyracks/hyracks-dataflow-std/pom.xml b/hyracks/hyracks-dataflow-std/pom.xml
index 56046f7..8e67891 100644
--- a/hyracks/hyracks-dataflow-std/pom.xml
+++ b/hyracks/hyracks-dataflow-std/pom.xml
@@ -45,5 +45,10 @@
<type>jar</type>
<scope>test</scope>
</dependency>
+ <dependency>
+ <groupId>commons-io</groupId>
+ <artifactId>commons-io</artifactId>
+ <version>2.4</version>
+ </dependency>
</dependencies>
</project>