* Sync Spock dependency versions
* Now that Spock no longer depends on 'groovy-all', for the database test it was
necessary to add 'groovy-sql'.
* Make feature method names friendlier in unrolled DatabaseDrivenSpec
* Make IncludeExcludeExtensionSpec print messages
This way the user can verify visually that in-/excludes actually work as
expected.
* Upgrade Groovy 2.5.12 -> 2.5.13
* Slightly adjust README.adoc
Change passive style "all feedback is appreciated" to active style "we
appreciate all feedback".
Setting system property "spock.configuration" during class
initialisation is too late for Spock to pick up the config, so the
static block is pointless and misleads users to believe they can
actually configure the system this way.
Instead the Javadoc was amended by information how to set the system
property via '-D' JVM command-line argument when running a test from an
IDE (or from the command line, for that matter).