Use `Arrays.asList()` instead of `Collections.arrayToList()` in
places where a generic type needs to be supplied by the caller.
This maintains compile-time compatibility with both Spring 3 and 4,
where Spring 4 added the generic type to the utility class.
The four occurrences where this was needed are not impacted
by the fact that `Arrays.asList()` returns an unmodifiable list.
updated pom to emit compiler warnings so that any new ones become obvious
added serialVersionUID to classes that could reasonably need to be serialized (GenericMessage, MessageHeaders, etc)
@SuppressWarnings("serial") on all others
@SuppressWarnings("unused") on private static classes used as spring beans for testing (their methods never get called from java)
eliminated all redundant casting
introducted generics metadata where raw types were still being used
changed public API on several FactoryBeans (by adding <Type> information to 'implements FactoryBean' clause)
@Ignore'd SimpleTcpNetOutboundGatewayTests#testOutboundClose() to avoid failure; this failure is correlated to the module name change, but hard to understand how it would be caused by it
