Downgrade to previous surefire release to fix Maven 2 compatibility issue.
diff --git a/pom.xml b/pom.xml
index 3462ff4..817062b 100644
--- a/pom.xml
+++ b/pom.xml
@@ -438,7 +438,7 @@
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-surefire-plugin</artifactId>
-                    <version>2.12.1</version>
+                    <version>2.12</version>
                 </plugin>
             </plugins>
         </pluginManagement>