Ignore missing proxy when removing grid-type batch jobs. #3072

In the HTCondor-CE, we can have a grid job's sandbox disappear before
the gridmanager picks up the job for removal. The gridmanager
immeidately puts the job on hold because it can't read the proxy. But we
don't need the proxy to remove the job.
Docs for removing grid-type batch jobs after proxy deletion. #3072
Set 8.2.5 release date to Dec 1, 2014 and reorder version history items.
Merge branch 'V8_2_5-branch' into V8_2-branch