Merge into master from pull request #53:

...floodlightcontroller/core/IFloodlightProviderService.java

src/main/java/net/floodlightcontroller/core/IListener.java

...ava/net/floodlightcontroller/core/IOFMessageListener.java

...net/floodlightcontroller/core/OFMessageFilterManager.java

...va/net/floodlightcontroller/core/internal/Controller.java

...dlightcontroller/core/module/FloodlightModuleContext.java

...odlightcontroller/core/module/FloodlightModuleLoader.java

...lightcontroller/core/module/IFloodlightModuleContext.java

...erializers/PerfMonCumulativeTimeBucketJSONSerializer.java

...tcontroller/devicemanager/internal/DeviceManagerImpl.java

src/main/java/net/floodlightcontroller/hub/Hub.java

...t/floodlightcontroller/learningswitch/LearningSwitch.java

...ntroller/linkdiscovery/internal/LinkDiscoveryManager.java

...t/floodlightcontroller/perfmon/CircularTimeBucketSet.java

...et/floodlightcontroller/perfmon/CumulativeTimeBucket.java

...dlightcontroller/perfmon/IPktInProcessingTimeService.java

...floodlightcontroller/perfmon/NullPktInProcessingTime.java

...va/net/floodlightcontroller/perfmon/OneComponentTime.java

...ava/net/floodlightcontroller/perfmon/PerfMonResource.java

...ava/net/floodlightcontroller/perfmon/PerfWebRoutable.java