title: Adding attributes to the root xml stream
body: <p>Tried to look around for solutions but could not find any easy way to add attributes to root xml tag in beanIO 1.2.</p>
  
  <p>I need to implement something like below:</p>
  
  <pre><code>&lt;?xml version='1.0' encoding='utf-8'?&gt;
                  &lt;MyRootNode clientCode="German" recordCount="1"&gt;
                      &lt;referrals&gt; 
                          &lt;Individual&gt;
                              &lt;indvId&gt;50853&lt;/indvId&gt;          
                              &lt;firstName&gt;Dad&lt;/firstName&gt;
                              &lt;middleName/&gt;
                              &lt;lastName&gt;Test&lt;/lastName&gt;
                              &lt;suffixName/&gt;
                              &lt;gender&gt;M&lt;/gender&gt;
                              &lt;race&gt;WH&lt;/race&gt;
                              &lt;ethnicity&gt;UN&lt;/ethnicity&gt;
                              &lt;DOB&gt;2000-02-02&lt;/DOB&gt;
                              &lt;caseNumber&gt;710645&lt;/caseNumber&gt;
                          &lt;/Individual&gt;       
                      &lt;/referrals&gt;
                  &lt;/MyRootNode&gt;
  </code></pre>
  
  <p>As of now my beanio mapping file looks like :</p>
  
  <pre><code>&lt;stream name="MyRootNode" format="xml"&gt;
                          &lt;record name="referrals" class="example.test.TestBean"&gt;
                              &lt;bean name="individual" class="example.test.Individual" xmlName="Individual"&gt;
                                  &lt;field name="indvId" /&gt;
                                  &lt;field name="firstName" minOccurs="1" /&gt;
                                  &lt;field name="middleName" minOccurs="1" /&gt;
                                  &lt;field name="lastName" minOccurs="1" /&gt;
                                  &lt;field name="suffixName" minOccurs="1" /&gt;
                                  &lt;field name="gender" minOccurs="1" /&gt;
                                  &lt;field name="race" minOccurs="1" /&gt;
                                  &lt;field name="ethnicity" minOccurs="1" /&gt;
                                  &lt;field name="DOB" minOccurs="1" /&gt;
                                  &lt;field name="caseNumber" minOccurs="1" /&gt;
                              &lt;/bean&gt;
                              &lt;/record&gt;
                  &lt;/stream&gt;
  </code></pre>
  
  <p>Need to add  <B><code>clientCode="German" recordCount="1"</code></B>  to the MyRootNode. </p>
  
  <p>Appreciate your help!</p>
  
  <p>Thanks &amp; Regards,
  Rajiv</p>