Corrected for Flume 1.4.0 and Explained Steps for Non-CM Environment

This change clarifies some things I had trouble with following the instructions on a CDH 4.4.0 installation not managed by CM. Specifically, it addresses the problem I described in issue #8 (https://github.com/cloudera/cdk-examples/issues/8) and it gives specific steps for configuring HDFS and Flume for this example outside of Cloudera Manager.