upgrade hadoop to CDH 4.2.1
upgrade jetty to 8.1.11.v20130520
log any errors
verify number of events written to hdfs
docs
print backoff time
use new MiniDFSCluster.Builder to setup HDFS
print start/end banners around each test
fix test
Fixed HDFS write failure in CDH4

* If the NameNode is restarted after a file has been opened, calling
  write on the OutputStream can now raise an exception. To fix, we
  trap any errors to the remote path in write() so that local writes
  may continue
short-circuit commit/rollback if tx already closed
raise log levels
set delay in ms
don't use deprecated SequenceFile methods; fixed some warnings