Adding the yammer counter library to pom

This adds the dependency for the yammer counter library and for the
google collection that are used with it.

Signed-off-by: Amnon Heiman <amnon@cloudius-systems.com>

pom.xml

@@ -32,6 +32,17 @@
             <artifactId>javax.json</artifactId>
             <version>1.0.4</version>
         </dependency>
+        <dependency>
+            <groupId>com.yammer.metrics</groupId>
+            <artifactId>metrics-core</artifactId>
+            <version>2.2.0</version>
+        </dependency>
+        <dependency>
+            <groupId>com.google.collections</groupId>
+            <artifactId>google-collections</artifactId>
+            <version>1.0</version>
+        </dependency>
+
     </dependencies>
     <build>
         <plugins>