Fix import order in ArchetypeConfiuration

This closes #10
diff --git a/maven-archetype-plugin/src/main/java/org/apache/maven/archetype/ui/ArchetypeConfiguration.java b/maven-archetype-plugin/src/main/java/org/apache/maven/archetype/ui/ArchetypeConfiguration.java
index a17935f..9899cd3 100644
--- a/maven-archetype-plugin/src/main/java/org/apache/maven/archetype/ui/ArchetypeConfiguration.java
+++ b/maven-archetype-plugin/src/main/java/org/apache/maven/archetype/ui/ArchetypeConfiguration.java
@@ -19,6 +19,9 @@
  * under the License.
  */
 
+import org.apache.maven.archetype.common.Constants;
+import org.codehaus.plexus.util.StringUtils;
+
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
@@ -26,9 +29,6 @@
 import java.util.Properties;
 import java.util.regex.Pattern;
 
-import org.apache.maven.archetype.common.Constants;
-import org.codehaus.plexus.util.StringUtils;
-
 public class ArchetypeConfiguration
 {
     private String groupId;