JIRA: https://jira.spring.io/browse/INT-3958
* Introduce `compileStatic` and `compilerConfiguration` properties for the `GroovyScriptExecutingMessageProcessor`,
to allow to customize the Groovy Script compilation
* Introduce `compile-static` and `compiler-configuration` options on the `<int-groovy:script>` component
* Change `RefreshableResourceScriptSource.suggestedClassName()` to return the **full** file name together with the
extension. That may be useful during the filtering phase for Compiler customization
* Modify tests to demonstrate different Compiler customization tricks
* Since Spring Boot 1.4 is already based on the SF-4.3, make an appropriate upgrade, too
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