Finished release 1.5.2.
Post Release: Version 1.5.2 -> 1.5.3dev.
Fix version typo in changelog.
Switch to Zenoss 5 writeMetricWithMetadata() API.

Fixes ZEN-14629.
Merge pull request #15 from zenoss/feature/ZEN-14629

Switch to Zenoss 5 writeMetricWithMetadata() API.
Release: Version 1.5.3dev -> 1.5.3.
Finished release 1.5.3.