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
* incremental progress on getting docbkx working
- downgraded docbook 4.5 -> 4.4 because of "URI is not file" errors (`find src/docbkx/*.xml | xargs grep -l '4\.5' | xargs perl -p -i -e 's/4\.5/4.4/g'`)
- eliminated spring-integration-reference in favor of idiomatic src/docbkx under project root
- using xsl from spring-ws to get things working. need to figure out how to integrate previous xsl, however (it's still there), because the L&F is quite different now
- upgraded version of docbkx plugin to 2.0.9
