documentation: Prepped for a 2.0.2 release

* poky.ent variables updated for the new release
* <manual>.xml files added the 2.0.2 entry in the manual revision
  table.  Used "TBA 2016" for now.
* mega-manual.sed file updated to replace "2.0.1" with "2.0.2"

(From yocto-docs rev: 0c112723d6982f7ddb6f2908389b5610937ff48f)

Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/ref-manual/ref-manual.xml

@@ -102,6 +102,11 @@
                 <date>March 2016</date>
                 <revremark>Released with the Yocto Project 2.0.1 Release.</revremark>
             </revision>
+            <revision>
+                <revnumber>2.0.2</revnumber>
+                <date>TBA 2016</date>
+                <revremark>Released with the Yocto Project 2.0.2 Release.</revremark>
+            </revision>
         </revhistory>
 
     <copyright>