SpringBeanProcessorServletAware loads wrong attributes

With commit ba570b0.. the ResteasyBootstrap class now sets the ResteasyDeployment as attribute into the context instead of the ResteasyProviderFactory, the Dispatcher and the Registry.

Since now these three are not in the context anymore and only reachable over the ResteasyDeployment, org.jboss.resteasy.plugins.spring.SpringBeanProcessorServletAware should also load these classes over the ResteasyDeployment from the context.

Little note: The servletContext should be protected instead of private.