Issue: SPR-13232

Also adding several further Joda-Time converters for consistency with JSR-310 converters.

Issue: SPR-11259

 - Cache interceptor internals now operate on collections of
   <? extends Cache> instead of <Cache>.
 - Deleted unused imports.
 - Deleted dead code.
 - Suppressed warnings for resource leaks related to not closing
   ApplicationContexts in tests.
 - Suppressed further non-issue warnings in tests.

This is largely derived from our existing Joda-Time support, with corresponding classes wherever possible.

Issue: SPR-9641