title: Using "Comma" or "pipe" within JunitParams
body: <p>I'm trying to  use JunitParams in order to parametrized my tests. But my main problem is that the parameters are strings with special characters, tilde or pipe.</p>
  
  <pre><code>import org.junit.Rule;
  import org.junit.Test;
  import org.junit.rules.ExpectedException;
  import org.junit.runner.RunWith;
  
  import junitparams.JUnitParamsRunner;
  import junitparams.Parameters;
  
  @RunWith(JUnitParamsRunner.class)
  public class TheClassTest {
  
      @Rule
      public ExpectedException exception = ExpectedException.none();
  
       @Test
       @Parameters({"AA~BBB"})
       public void shouldTestThemethod(String value) throws Exception {
          exception.expect(TheException.class);
  
          TheClass.theMethod(value);     
          // Throw an exception if value like "A|B" or "A~B",
          // ie if value contain a ~ or a |
      }
  }
  </code></pre>
  
  <p>With tilde, I have no problem.
  But with pipe, I have an exception:</p>
  
  <pre><code>java.lang.IllegalArgumentException: wrong number of arguments
  </code></pre>
  
  <p>The pipe, as the comma, is used as a separator for parameters.</p>
  
  <p>Is there any way for me to set a different separator? 
  Or is this a limitation of JunitParams?</p>