Added Benjamin Walstrum's contribution of DoubleMetaphone, added Benjamin to the contributors

git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/codec/trunk@130153 13f79535-47bb-0310-9956-ffa450edef68

Author: Timothy O'Brien

project.xml

@@ -93,6 +93,10 @@
      <email>steve.zimmermann@heii.com</email>
      <roles>documentation</roles>
    </contributor>
+   <contributor>
+     <name>Benjamin Walstrum</name>
+     <email>ben@walstrum.com</email>
+   </contributor>
   </contributors>  
 
   <dependencies>