added last-checked property to redis job status; added update of job status periodically;  remove jobs from tracking once they disappear from oozie
added last-checked property to redis job status; added update of job status periodically;  remove jobs from tracking once they disappear from oozie

alexmilowski/python-hadoop-rest-api,alexmilowski/python-hadoop-rest-api,alexmilowski/python-hadoop-rest-api