Merge pull request #13 from apache/dep

declare commons-io as a dependency
diff --git a/pom.xml b/pom.xml
index 31fd4bb..a8172ba 100644
--- a/pom.xml
+++ b/pom.xml
@@ -99,6 +99,11 @@
       <artifactId>sisu-inject-plexus</artifactId>
       <version>1.4.2</version>
     </dependency>
+    <dependency>
+      <groupId>commons-io</groupId>
+      <artifactId>commons-io</artifactId>
+      <version>2.6</version>
+    </dependency>
 
     <dependency>
       <groupId>org.sonatype.aether</groupId>