Add Ehcache 1.6.0-beta5 to our dependency list

This supports some more complex cache strategies than just a simple
HashMap in core, in particular caches that are stored on disk when
they ar too big for main memory.

Signed-off-by: Shawn O. Pearce <sop@google.com>
diff --git a/Documentation/licenses.txt b/Documentation/licenses.txt
index 126c889..7673a02 100644
--- a/Documentation/licenses.txt
+++ b/Documentation/licenses.txt
@@ -27,6 +27,7 @@
 OpenID4Java                 <<apache2,Apache License 2.0>>
 OpenXRI                     <<apache2,Apache License 2.0>>
 Neko HTML                   <<apache2,Apache License 2.0>>
+Ehcache                     <<apache2,Apache License 2.0>>
 ICU4J                       <<icu4j,ICU4J License>>
 JGit                        <<jgit,New-Style BSD>>
 JSch                        <<sshd,New-Style BSD>>
diff --git a/pom.xml b/pom.xml
index e97595d..0890829b 100644
--- a/pom.xml
+++ b/pom.xml
@@ -518,6 +518,12 @@
     </dependency>
 
     <dependency>
+      <groupId>net.sf.ehcache</groupId>
+      <artifactId>ehcache</artifactId>
+      <version>1.6.0-beta4</version>
+    </dependency>
+
+    <dependency>
       <groupId>javax.mail</groupId>
       <artifactId>mail</artifactId>
       <version>1.4.1</version>