Hudson upgraded

[Nigel Daley]

I upgraded Hudson to 1.136 and installed a couple new plugins.  You  
can see findbugs, checkstyle, and code coverage graphed as part of  
the Hadoop-Nightly build:
http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Nightly/
I also added project logos to the top level dashboard:
http://lucene.zones.apache.org:8080/hudson/

Cheers,
Nige