Add commons-pool2-2.2.jar to build.gradle and update jar requirements in README.

Author: jcoleman

README.markdown

@@ -47,7 +47,11 @@ Add the following into your Tomcat context.xml (or the context block of the serv
 
 The Valve must be declared before the Manager.
 
-Copy the tomcat-redis-session-manager.jar and jedis-2.0.0.jar files into the `lib` directory of your Tomcat installation.
+Copy the following files into the `TOMCAT_BASE/lib` directory:
+
+* tomcat-redis-session-manager-VERSION.jar
+* jedis-2.5.2.jar
+* commons-pool2-2.2.jar
 
 Reboot the server, and sessions should now be stored in Redis.
 

build.gradle

@@ -8,6 +8,7 @@ repositories {
 dependencies {
   compile group: 'org.apache.tomcat', name: 'tomcat-catalina', version: '7.0.27'
   compile group: 'redis.clients', name: 'jedis', version: '2.5.2'
+  compile group: 'org.apache.commons', name: 'commons-pool2', version: '2.2'
   // compile group: 'commons-collections', name: 'commons-collections', version: '3.2'
   // testCompile group: 'junit', name: 'junit', version: '4.+'
 }