add DBUnitForJUnit4#getDatabaseDataSet()
refactoring remove not use parameters
extract DerbyDBUnit
modify DerbyDBUnit not throw Check Exception
test rename
remove DerbyDbTestCase
test rename
Merge remote-tracking branch 'origin/master'

Conflicts:
	src/test/java/froop/db/jdbc/JUnit4JdbcSampleTest.java
	src/test/java/froop/db/testutil/DBUnitForJUnit4.java