Merge into master from pull request #39:

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

...dlightcontroller/core/IOFMessageFilterManagerService.java

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

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

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

...dlightcontroller/perfmon/IPktInProcessingTimeService.java

...floodlightcontroller/perfmon/NullPktInProcessingTime.java

...java/net/floodlightcontroller/perfmon/PerfMonConfigs.java

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

src/main/java/org/openflow/protocol/OFMessage.java