Constructors have been added to both FrameworkServlet and
DispatcherServlet to support instance-based programmatic registration
of Servlets within ServletContainerInitializer implementations in
Servlet 3.0+ environments, and more particularly when using Spring 3.1's
WebApplicationInitializer SPI.
This change also renames the method added to FrameworkServlet in
SPR-8185 from #initializeWebApplicationContext to #applyInitializers.
The reason being that a method named #initWebApplicationContext was
already present and the names overlapped confusingly.
Issue: SPR-7672, SPR-8185
git-svn-id: https://src.springframework.org/svn/spring-framework/trunk@4380 50f2f4bb-b051-0410-bef5-90022cba6387