Introduce "Aware" superinterface

All existing *Aware interfaces have been refactored to extend this
new marker interface, serving two purposes:

    * Easy access to a type hierarchy that can answer the question
      "What *Aware interfaces are available?", without requiring
      text-based searches. Also clearly excludes false positives like
      TargetClassAware and ParamAware, which while similarly named,
      are not semantically similar to traditional *Aware interfaces
      in Spring.

    * Minor potential performance improvements in
      AbstractAutowireCapableBeanFactory and
      ApplicationContextAwareProcessor. Both have blocks of sequential
      instanceof checks in order to invoke any *Aware interface callback
      methods. For a bean that implements none of these interfaces,
      the whole sequence can be avoided by guarding first with
          if (bean instanceof Aware) {
              ...
          }

Implementors of custom *Aware-style interfaces (and presumably
the BeanPostProcessors that handle them), are encouraged to refactor to
extending this interface for consistency with the framework as well as
the points above.

org.springframework.context.support/src/main/java/org/springframework/scheduling/quartz/SchedulerContextAware.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2006 the original author or authors.
+ * Copyright 2002-2011 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -17,6 +17,7 @@
 package org.springframework.scheduling.quartz;
 
 import org.quartz.SchedulerContext;
+import org.springframework.beans.factory.Aware;
 
 /**
  * Callback interface to be implemented by Spring-managed
@@ -27,11 +28,12 @@ import org.quartz.SchedulerContext;
  * that are passed in via Spring's SchedulerFactoryBean.
  *
  * @author Juergen Hoeller
+ * @author Chris Beams
  * @since 2.0
  * @see org.quartz.spi.JobFactory
  * @see SchedulerFactoryBean#setJobFactory
  */
-public interface SchedulerContextAware {
+public interface SchedulerContextAware extends Aware {
 
 	/**
 	 * Set the SchedulerContext of the current Quartz Scheduler.