#25 Pick the matching test first

[Elliotte Rusty Harold]

Jester should be smarter about which tests it runs first. Rather than running the entire test suite, it should look for a matching test class. For instance, if it's mutating the class Foo it should look for a test class named FooTest (in whatever) package, and run those tests first before trying every other test.

After that, we might want then to run tests in other classes that import Foo, and only after that to run all other tests.

This could really speed up execution.