* Upgrade to Gradle-2.5, SI-4.2.4
* Remove redundant dependencies
* Add `slf4j-log4j12` to avoid log noise during testing
* Add `settings.gradle` to allow Artifactory Release Management
* Move XSD stuff to the proper place - `org\springframework\integration\zip\config`
* Get rid of manual `enum` transformation in the `Parser`:
- we can't do that there because `property-placeholder` and SpEL are processed later
- no reason to do that at all - `enum`s are properly converted by the SF during bean population phase
* Fix `UnZipTransformer` to `delete()` file in the `finally` block after closing the `InputStream` on file
