title: Error using Mockito and Specs2
body: <p>I have the following spec:</p>
  
  <pre><code>import org.specs2.mock.Mockito
  import org.specs2.mutable.Specification
  
  class LinkUserServiceSpec extends Specification with Mockito {
  
    val linkUserService = mock[LinkUserService]
  
    "The 'LinkUserService' isUserLinked method" should {
        "return false when a previously unlinked userId is passed in for a given service" in {
            linkUserService.isUserLinked("nobody", "YT") returns false
  
            linkUserService.isUserLinked("nobody", "YT") must beFalse
        }
    }
  }
  </code></pre>
  
  <p>And the following dependency in my build.sbt:</p>
  
  <p><code>"org.specs2"              %%  "specs2"        % "2.2" % "test"</code></p>
  
  <p>However I get this error when I type <code>test</code> into the sbt console:</p>
  
  <pre><code>[error] bad symbolic reference. A signature in MocksCreation.class refers to type MockSettings
  [error] in package org.mockito which is not available.
  [error] It may be completely missing from the current classpath, or the version on
  [error] the classpath might be incompatible with the version used when compiling MocksCreation.class.
  [error] bad symbolic reference. A signature in MockitoStubs.class refers to term stubbing
  [error] in package org.mockito which is not available.
  [error] It may be completely missing from the current classpath, or the version on
  [error] the classpath might be incompatible with the version used when compiling MockitoStubs.class.
  [error] two errors found
  [error] (test:compile) Compilation failed
  [error] Total time: 3 s, completed Sep 12, 2013 3:23:41 PM
  </code></pre>
  
  <p>Anyone know what this could be?</p>