Implement REST APIs for flows:

- get all flows
- get all flows for a device
- get all flows for a device with a given ID

Change-Id: Ifb1541e4ae4a7e49f1347b34bef2fe788902368d
diff --git a/web/pom.xml b/web/pom.xml
index a30d595..a5e3c47 100644
--- a/web/pom.xml
+++ b/web/pom.xml
@@ -63,10 +63,7 @@
             <scope>test</scope>
         </dependency>
 
-        <dependency>
-            <groupId>com.google.guava</groupId>
-            <artifactId>guava</artifactId>
-        </dependency>
+
 
         <dependency>
             <groupId>com.sun.jersey</groupId>
@@ -131,6 +128,7 @@
                             com.fasterxml.jackson.databind,
                             com.fasterxml.jackson.databind.node,
                             com.google.common.base.*,
+                            com.google.common.collect.*,
                             org.eclipse.jetty.websocket.*,
                             org.onlab.util.*,
                             org.onlab.osgi.*,