[maven-release-plugin]prepare release v4.2.5
[maven-release-plugin]prepare for next development iteration
fix data map serialization bug
[maven-release-plugin]prepare release v4.2.6
[maven-release-plugin]prepare for next development iteration
Unit test for data map serialization bug fix.
Revert "Merge pull request #83 from addthis/keytopper-fix2-export"

This reverts commit 90a687f818c592a38863580105025f0c7bb3fd16, reversing
changes made to fc5a38e96e0556f0e166ff6f780591b5561ffe3f.
Merge branch 'master' into frame-reader-redux