Filtering tests

When using the IOSuite variants, the user can call sbt's test command as such:

> testOnly -- -o *foo*

This filter will prevent the execution of any test that doesn't contain the string "foo" in is qualified name. For a test labeled "foo" in a "FooSuite" object, in the package "fooPackage", the qualified name of a test is:

fooPackage.FooSuite.foo