Bug #52 Create 'merge' Ant task

Added basic implementation of a merge task.  Documentation and tests also updated.
diff --git a/org.jacoco.doc/docroot/doc/changes.html b/org.jacoco.doc/docroot/doc/changes.html
index 2ae7ddd..b66b5ff 100644
--- a/org.jacoco.doc/docroot/doc/changes.html
+++ b/org.jacoco.doc/docroot/doc/changes.html
@@ -29,6 +29,7 @@
 <h3>New Features</h3>

 <ul>

   <li><code>enabled</code> property added to <a href="ant.html#agent">Agent</a> and <a href="ant#coverage">Coverage</a> tasks (Trac #63).</li>

+  <li><a href="ant.html#merge">Merge</a> Ant task added (Trac #52).</li>

 </ul>

 

 <h3>Fixed Bugs</h3>