title: Cannot use readMavenPom in Jenkinsfile
body: <p>I am working on a Jenkinsfile for use with Jenkins 2.0.  The <code>readMavenPom</code> method is not recognized.  Is there some configuration I am missing to make this available?</p>
  
  <p>My Jenkinsfile:</p>
  
  <pre class="lang-groovy prettyprint-override"><code>node {
    stage 'Checkout'
    checkout scm
    env.PATH = "${tool 'maven-3'}/bin:${env.PATH}"
    stage 'Build'
    def pom = readMavenPom file: 'pom.xml'
    echo "${pom}"
    sh "mvn -DskipTests=true verify"
  }
  </code></pre>
  
  <p>When run, I get the following error:</p>
  
  <blockquote>
  <pre><code>java.lang.NoSuchMethodError: No such DSL method 'readMavenPom' found among
  [AWSEBDeployment, archive, bat, build, catchError, checkout, deleteDir, dir, echo,
  emailext, error, fileExists, git, input, isUnix, load, mail, node, parallel,
  properties, pwd, readFile, retry, sh, slackSend, sleep, stage, stash, step, svn,
  timeout, tool, unarchive, unstash, waitUntil, withCredentials, withEnv, wrap,
  writeFile, ws]
  </code></pre>
  </blockquote>