Added a configuration parameter to the yaml which allows people to set JAVA_HOME independent of the environment.
Fixing formatting.
Reverting formatting.
Fixing typo in yaml.
Allows the yarn classpath to be set via yaml as well.
Added a bit more documentation, which tells people how to get their yarn classpath.
Merge pull request #54 from boneill42/master

Allow JAVA_HOME  and yarn classpath to be set via configuration parameter in yaml.