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Handle deferred from applyMaps.

Fixes ZEN-12397.
Simplify handling applyMaps deferred.

Fixes ZEN-12397.
Cleanup handling of applyMaps deferred.

Fixes ZEN-12397.
Merge pull request #7 from zenoss/feature/ZEN-12397

Please review branch feature/ZEN-12397
Version: 1.5.0dev -> 1.4.1dev.
Support TALES evaluation of datapoint properties.
Merge pull request #8 from zenoss/feature/dp_prop_tales

Please review branch feature/dp_prop_tales
TALES on None should return None, not 'None'.
Fix irrelevant errors when zenpython is stopped.
Merge pull request #10 from zenoss/feature/fixStopErrors

Please review branch feature/fixStopErrors
Merge pull request #9 from zenoss/feature/noneSafeTales

Please review branch feature/noneSafeTales
Support multiple datapoint timestamps per cycle.
Merge pull request #11 from zenoss/feature/multi-dp-timestamps

Please review branch feature/multi-dp-timestamps
Version 1.4.1dev -> 1.5.0dev.

Commit a5e7c330cc introduced a backwards-compatible API change.
Incrementing minor version.
Document 1.5.0 changes.
Release: Version 1.5.0dev -> 1.5.0.
Finished release 1.5.0.
Finished release 1.5.0.
Post Release: Version 1.5.0 -> 1.5.1dev.