Prepare release 2.2.1.

Author: marchof

com.mountainminds.eclemma.doc/pages/changes.html

@@ -11,7 +11,7 @@
 
 <h1>EclEmma Change Log</h1>
 
-<h2>Trunk Build (not yet released)</h2>
+<h2>Version 2.2.1 (2013/06/09)</h2>
 <ul>
   <li>Keyboard shortcuts to launch TestNG tests and suites (GitHub #1).</li>
   <li>New session import option to import execution data from a JaCoCo agent (GitHub #2).</li>