Fix HandlerFactory after breaking changes in ratpack-core.
Initial implementation of single database query test type
Prefer Foreground executor.
Statically import ResponseData to be consistent with the Java app
Update setup_groovy.py script to accommodate db tests.
Tidy up.
Test single query.

Temporarily added to ratpack-groovy spec only, at least until the /db
endpoint is implement in ratpack-java as well.
Relax date assertions.

Now that the ApplicationUnderTest is shared and the date in
ratpack-java is set periodically, the testStartTime can actually be
later than the date in the response headers and as a result some tests
will fail.
testStartDate not needed anymore, remove.
Refactor specs using response clone everywhere.
Upgrade to Ratpack 0.9.2-SNAPSHOT.
Update README.
Typo.
Change Action package according to latest changes in ratpack-core.
Initial implementation of multiple database queries test type.
Update README.
Initial implementation of database updates test type.
Update README.