Revert bundlor version update.

Config was wrong, but even with the correct config
the maven jar plugin generates its own manifest
file and ignores the one generated by bundlor.

pom.xml

@@ -281,7 +281,7 @@
                 <plugin>
                     <groupId>com.springsource.bundlor</groupId>
                     <artifactId>com.springsource.bundlor.maven</artifactId>
-                    <version>1.0.0.RC1</version>
+                    <version>1.0.0.M6</version>
                     <executions>
                         <execution>
                             <id>bundlor</id>