jdbc:script's "separator" and "execution" attributes work nested with embedded-database as well; added "encoding" attribute to jdbc:script element; general revision of DatabasePopulator configuration and execution code

Prior to this change, a parsing exception would be thrown if a
<description> element was placed within a <map><entry/></map>
element. The beans XSD has always permitted this arrangement,
but BeanDefinitionParserDelegate did not respect it. The latter now
simply ignores any <description> element, rather than failing.

Issue: SPR-8563

DefaultListableBeanFactory allows for init methods to register further bean definitions (again; SPR-7757)

SPR-8483 Update reference documentation with multipart request-related changes: @RequestPart, Servlet 3.0 multipart reuqests, javax.servlet.http.Part method argument types.

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

fixed OpenEntityManagerInViewTests through the addition of a local copy of our Servlet API mocks; restoredOpenPersistenceManagerInViewTests

SPR-5628 Add HttpPutFormContentFilter in order to make form encoded data available via ServletRequest.getParameter*()

JpaTransactionManager etc can find EntityManagerFactory by "persistenceUnitName" property now, falling back to retrieval of a unique EntityManagerFactory bean by type (analogous to @PersistenceUnit / @PersistenceContext)

JpaTransactionManager etc can find EntityManagerFactory by "persistenceUnitName" property now, falling back to retrieval of a unique EntityManagerFactory bean by type (analogous to @PersistenceUnit / @PersistenceContext)

defensive checking that a provided class actually implements WebApplicationInitializer (SPR-8557); avoid early initialization of Commons Logging (using ServletContext logging instead)