Move tempLocation to PipelineOptions.

[peihe]

It is back ported from:
apache/beam#44

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[peihe]

R: @dhalperi

[dhalperi]

R: @davorbonaci

Davor explicitly decided not to backport this in the Great Backporting of 2016 (tm) because it is not backwards-compatible.

[davorbonaci]

It is backward-compatible. Merging.