2.6.0-RC2 depends upon junit:junit-dep:4.4, which doesn't include org.junit.runners.BlockJUnit4ClassRunner

Hi,

I'm using 2.6.0-RC2, sourced from a Maven repository. I've noticed
that org.jmock.integration.junit4.JMock extends
org.junit.runners.BlockJUnit4ClassRunner, which is not present in the
version of JUnit that JMock depends upon.

The `jmock-junit4' POM file contains:

    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit-dep</artifactId>
      <version>4.4</version>
    </dependency>

As a result, when I attempt to execute test classes that have
` <at> RunWith(JMock.class)', I get errors complaining about the missing
BlockJUnit4ClassRunner class. To solve this, I've had to add a
dependency on a more modern version of JUnit to my project POM, and
specifically exclude this version of junit-dep.

So this:

     <dependency>
      <groupId>org.jmock</groupId>
      <artifactId>jmock-junit4</artifactId>
      <version>2.6.0-RC2</version>
      <scope>test</scope>
    </dependency>