* 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
* normalizing version placeholders to use ${groupId}.version as a naming convention e.g.: 'org.springframework.version'
* added properties to parent pom <properties/> section
* spaces -> tabs
* removed empty newlines in poms (favor comments instead of newlines)
* gave all samples nice <name>s
* included ws-inbound-gateway in the samples parent pom <modules> section
* samples now try to run any **/*Tests.java, as per our general conventions
