feat(ActiveMQ): add ActiveMQ policy

Not much going on here other than setting the default idle timeout
for new connections. ActiveMQ seems to be pretty stuck at 30s for
this value.

lib/index.js

@@ -13,6 +13,7 @@ module.exports = {
     ServiceBusQueue: require('./policies/service_bus_queue_policy'),
     ServiceBusTopic: require('./policies/service_bus_topic_policy'),
     QpidJava: require('./policies/qpid_java_policy'),
+    ActiveMQ: require('./policies/activemq_policy'),
     Utils: pu,
     merge: function(newPolicy, base) {
       return u.deepMerge(newPolicy, base || DefaultPolicy);

lib/policies/activemq_policy.js

@@ -0,0 +1,19 @@
+'use strict';
+
+var u = require('../utilities'),
+    DefaultPolicy = require('./default_policy');
+
+module.exports = u.deepMerge({
+  defaultSubjects: false,
+
+  connect: {
+    options: {
+      // By default ActiveMQ uses 30s for its idle timeout. The broker does not
+      // seem to honor a change to this value from the client side, and also does
+      // not send back that value as part of the handshake (it just returns
+      // whatever value we sent, without honoring that value)
+      idleTimeout: 30000,
+    }
+  }
+
+}, DefaultPolicy);