Application ClassLoader should be passed via deployer

Several gateways are doing something like this to set the class loader for incoming messages:

ClassLoader origCL = Thread.currentThread().getContextClassLoader();

try {
Thread.currentThread().setContextClassLoader(anotherCL);
}
finally {
Thread.currentThread().setContextClassLoader(origCL);
}

We should create a standard slot for the application loader and pass that in through init in the component's activator (or something equivalent).