SPR-7545 - Reference documentation now reflects the final state of the ResourceHttpRequestHandler and references the DefaultServletHttpRequestHandler properly.

When using PropertiesLoaderSupport implementations (principally
PropertyPlaceholderConfigurer), an assumption was made that any
Resource representing a set of properties must be file-based.  SPR-7547
exposed the fact that if a non-file-based Resource implementation such
as ByteArrayResource were passed in, an IllegalStateException would be thrown
from the AbstractResource base class' implementation of getFilename().

This is now patched, and PropertiesLoaderSupport implementations treat
Resource implementations equally, regardless of file-orientation.

See also SPR-7552.

Added support for looking up column values by column label to support CachedRowSetImpl which doesn't allow for column label use (SPR-7506); added some generics;

Before:

    - new GenericXmlApplicationContext("com/acme/path/to/resource.xml");

    - GenericXmlApplicationContext ctx = new GenericXmlApplicationContext();
      ctx.load("com/acme/path/to/resource.xml");
      ctx.refresh();

After:

    - The above remain supported, as well as new class-relative variants

    - import com.acme.path.to.Foo;
      new GenericXmlApplicationContext(Foo.class, "resource.xml");

    - import com.acme.path.to.Foo;
      GenericXmlApplicationContext ctx = new GenericXmlApplicationContext();
      ctx.load(Foo.class, "resource.xml");
      ctx.refresh();

These changes are generally aligned with signatures long available in
ClassPathXmlApplicationContext. As GenericXmlApplicationContext is
intended to be a more flexible successor to CPXAC (and FSXAC), it's
important that all the same conveniences are available.

fixed @mvc processing of parameter-level annotations to work with interface-based proxies again (SPR-7483)

revised @RequestParam processing to support CSV-to-array/collection binding with ConversionService (SPR-7479)

revised @RequestParam processing to support CSV-to-array/collection binding with ConversionService (SPR-7479)

DispatcherPortlet copies all action parameters to render parameters in case of an action exception (SPR-7495); shortened Portlet MVC's action exception render parameter value to "true"

allow for writing the response directly in a Portlet @ExceptionHandler method (like in the Servlet equivalent)