Update link to JDK 8 download
Update link to @SpringFramework team members
Place holder resolution in @JmsListener arguments

This commit allows to use place holder definitions for JmsListener
attributes, effectively allowing to externalize those settings from
the code.

Issue: SPR-12134
HibernateJpaDialect only resets Connection read-only status if actually necessary (avoiding side effects)

Issue: SPR-8959
Issue: SPR-12118
Improve what's new in Spring 4.1 section
polishing