The getForRequestUrl method of ResourceUrlProvider uses the
HandlerMapping.PATH_WITHIN_HANDLER_MAPPING_ATTRIBUTE attribute to
determine the relevant portion of the resource URL path.

However there are cases when that attribute may not have a leading
(e.g. when the current URL was matched to a prefix-based pattern
and hence extracted via PathMatcher#extractPathWithinPattern), which
interferes with the matching of resource URL paths to patterns.

This change ensures a leading slash is present

Issue: SPR-12281

An initial commit with expanded support for static resource handling:

- Add ResourceResolver strategy for resolving a request to a Resource
  along with a few implementations.

- Add PublicResourceUrlProvider to get URLs for client-side use.

- Add ResourceUrlEncodingFilter and
  PublicResourceUrlProviderExposingInterceptor along with initial
  MVC Java config support.

Issue: SPR-10933

This reverts commit d4a0e628, reversing
changes made to 8abe9497.

Issue: SPR-9186

Previously when running the tests for spring-web, spring-webmvc,
spring-test-mvc, and spring-orm there were possible collissions in the
classpath due to the fact that each had its own copy of the web.Mock*
classes in it. This causes uncertainty for which class the code was
running against. Furthermore, the maintance of keeping the copies up to
date was tedious.

Now there are two copies of the web.Mock* classes. The ones that exist
in spring-test main sources and a copy that supports servlet 3 within
spring-web test sources. The copy in spring-web test sources has been
moved to a new package to avoid having the classes exist twice on the
classpath within Eclipse.

ResourceHttpRequestHandler now implements InitializingBean and
checks for empty locations.

Issue: SPR-9186

This renaming more intuitively expresses the relationship between
subprojects and the JAR artifacts they produce.

Tracking history across these renames is possible, but it requires
use of the --follow flag to `git log`, for example

    $ git log spring-aop/src/main/java/org/springframework/aop/Advisor.java

will show history up until the renaming event, where

    $ git log --follow spring-aop/src/main/java/org/springframework/aop/Advisor.java

will show history for all changes to the file, before and after the
renaming.

See http://chrisbeams.com/git-diff-across-renamed-directories

SPR-8543 Fix issue in AnnotationMethodHandlerAdapter with extracting URI template variable from URL with file extension

SPR-8532 Upgrade org.springframework.web.servlet to Servlet 3.0 (as provided dependency) and add support for javax.servlet.Part parameter

SPR-7116 further work in progress.  Added white-listing by media type, checking MIME type from the ServletContext, and some additional validations.

SPR-7116 work in progress.  ResourceHttpRequestHandler is now functionally equivalent to the Spring JS ResourceServlet, with the exception of the resource concatenation feature (which will be deferred for reconsideration in 3.1).