floodlight: add google guava library 13

Google Guava is a general purpose utility library that simplifies common
tasks like handling strings (joining/parsing), collections (chaining
iterators), helpers for writing equals/hashcode etc.

Apache 2 licensed

http://code.google.com/p/guava-libraries/

build.xml

@@ -64,6 +64,7 @@
         <include name="concurrentlinkedhashmap-lru-1.2.jar"/>
         <include name="jython-2.5.2.jar"/>
         <include name="libthrift-0.7.0.jar"/>
+        <include name="guava-13.0.1.jar" />
     </patternset>
 
     <path id="classpath">