v0.17.0

This release contains the following changes:

• The Execution Contexts (ex in the code) have been moved from the *__jobs index to their own index *__ex #545
• The job_id has been added to the analytics index. #544
• The *__state and *__analytics indices are now time stamped and rolled over according to their specified or default frequency. The default for both is monthly.
• Fixed bug with updating existing jobs #533
• Improved /txt/slicers by adding job_id and name #536
• The slicer no longer interacts with the cluster_master after the initial job is started #518
• Slicers and workers can now be started stand alone, requiring only an environment variable set and the execution context present in the *__jobs index. #519