Bump version to 0.7.4 and update changelog.

Bump version to 0.7.3 and update changelog.

Bump version to 0.7.2 and update changelog.

Bump version to 0.7.1 and update ChangeLog.

Bump version to 0.7.0 and update ChangeLog.

Bump version to 0.6.6 and update changelog.

Bump version to 0.6.5 and update changelog.

Monitor the NC and handleIncomingMessages.

Monitor the NC and handleIncomingMessages.

Bump version to 0.6.4 and update ChangeLog.