Bug #52 allow any resource collections for merge task

Added check to not process directories
diff --git a/org.jacoco.doc/docroot/doc/ant.html b/org.jacoco.doc/docroot/doc/ant.html
index 233b13c..af35cf7 100644
--- a/org.jacoco.doc/docroot/doc/ant.html
+++ b/org.jacoco.doc/docroot/doc/ant.html
@@ -173,41 +173,6 @@
 </table>

 

 

-<h2><a name="merge">Task <code>merge</code></a></h2>

-

-<p>

-  This task can be used to merge the execution data from multiple test runs

-  into a single data store.

-</p>

-

-<pre class="source">

-<span class="nr">    1</span>&lt;jacoco:merge destfile="merged.exec"/>

-<span class="nr">    2</span>    &lt;fileset dir="executionData" includes="*.exec"/>

-<span class="nr">    3</span>&lt;/jacoco:merge/>

-</pre>

-

-

-<table class="coverage">

-  <thead>

-    <tr>

-      <td>Attribute</td>

-      <td>Description</td>

-      <td>Default</td>

-    </tr>

-  </thead>

-  <tbody>

-    <tr>

-      <td><code>destfile</code></td>

-      <td>Location to write the merged execution data.</td>

-      <td><i>none (required)</i></td>

-    </tr>

-  </tbody>

-</table>

-

-<h3>Element <code>fileset</code></h3>

-

-<p>Fileset containing the list of execution data files to be merged</p>

-

 <h2><a name="agent">Task <code>agent</code></a></h2>

 

 <p>

@@ -252,6 +217,43 @@
   </tbody>

 </table>

 

+

+<h2><a name="merge">Task <code>merge</code></a></h2>

+

+<p>

+  This task can be used to merge the execution data from multiple test runs

+  into a single data store. 

+</p>

+

+<pre class="source">

+<span class="nr">    1</span>&lt;jacoco:merge destfile="merged.exec"/>

+<span class="nr">    2</span>    &lt;fileset dir="executionData" includes="*.exec"/>

+<span class="nr">    3</span>&lt;/jacoco:merge/>

+</pre>

+

+<p>

+  The task definition can contain any number of resource collection types and

+  has the following mandatory attribute: 

+</p>

+

+<table class="coverage">

+  <thead>

+    <tr>

+      <td>Attribute</td>

+      <td>Description</td>

+      <td>Default</td>

+    </tr>

+  </thead>

+  <tbody>

+    <tr>

+      <td><code>destfile</code></td>

+      <td>Location to write the merged execution data.</td>

+      <td><i>none (required)</i></td>

+    </tr>

+  </tbody>

+</table>

+

+

 <h2><a name="report">Task <code>report</code></a></h2>

 

 <p>