Moved the REST API to it's own module.

...es/net.floodlightcontroller.core.module.IFloodlightModule

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

...floodlightcontroller/core/IFloodlightProviderService.java

...dlightcontroller/core/IOFMessageFilterManagerService.java

...n/java/net/floodlightcontroller/core/IRestApiService.java

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

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

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

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

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

...t/floodlightcontroller/core/module/IFloodlightModule.java

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

.../floodlightcontroller/core/module/IFloodlightService.java

...lightcontroller/core/web/AllSwitchStatisticsResource.java

...dlightcontroller/core/web/ControllerSwitchesResource.java

...va/net/floodlightcontroller/core/web/CoreWebRoutable.java

...floodlightcontroller/core/web/SwitchClustersResource.java

...tcontroller/core/web/SwitchCounterCategoriesResource.java

.../floodlightcontroller/core/web/SwitchCounterResource.java

...net/floodlightcontroller/core/web/SwitchResourceBase.java