Bug 591481 - Bump maxVersion of Feedback for beta6. Bumping compat to 4.0.* - r=dtownsend, a=blocking2.0-beta6

browser/app/profile/extensions/testpilot@labs.mozilla.com/install.rdf

@@ -13,7 +13,7 @@
       <Description>
         <em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id>
         <em:minVersion>3.5</em:minVersion>
-        <em:maxVersion>4.0b5</em:maxVersion>
+        <em:maxVersion>4.0.*</em:maxVersion>
       </Description>
     </em:targetApplication>