Merge into master from pull request #54:

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

...floodlightcontroller/core/web/JacksonCustomConverter.java

...e/web/serializers/CumulativeTimeBucketJSONSerializer.java

.../core/web/serializers/OneComponentTimeJSONSerializer.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

...net/floodlightcontroller/perfmon/PerfMonDataResource.java

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

...t/floodlightcontroller/perfmon/PerfMonToggleResource.java

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

...net/floodlightcontroller/perfmon/PktInProcessingTime.java