opened up RestTemplate method signatures to Map<String, ?> and Object array instead of enforcing String values

SPR-5327: tweak the ivy.xml so that commons-logging is a separate configuration.  It already comes out as optional in the generated poms (including core), which isn't great, but I can't see what is causing that

do not register default formatters for Date and Calendar (requiring explicit use of @DateTimeFormat there)

JSR-303 SpringValidatorAdapter uses field name as first argument (analogous to bind errors; SPR-6407)

initialize synchronization after begin while instantiating TransactionStatus as early as possible (SPR-6409)

+ renamed spring-agent.jar to org.springframework.instrument.jar through-out the documentation.

SPR-6375 - Register sensible default HTTP Message Converters based on what is available in the classpath