job refactor

[jsnoble]

several breaking changes: (you will need to npm install)
-doc updates
-seperated job from execution
-added additional api's to support changes
/jobs/{id}/_start => does not recover, just starts fresh job from what is stored

/jobs/{id}/_pause  => /ex/{id}/_pause
/jobs/{id}/_stop => /ex/{id}/_stop
/jobs/{id}/_resume  => /ex/{id}/_resume
/jobs/{id}/_pause  => /ex/{id}/_pause
/jobs/{id}/workers => /ex/{id}/workers
/jobs/{id}/slicers  =>  /ex/{id}/slicers

/ex
/ex/{id}
/ex|{id}/_recover  => starts recovery process

-slicer stats are now stored at end of job on ex
-made teraslice configuration all top level, no more cluster obj
-updated package.json
-removed clobbering of failed status