Normalise project to lower case in NPG mapper.
Update history.
Bump version.
Do not respawn workers which have exited intentionally.
Add options for limiting and delaying worker respawns.
Merge pull request #48 from nature/process-management

Improve respawn logic
Bump version.
Update readme.
Update command-line help.
Fix lint error.
Update history.
Missing parameter comments.
Better logging of worker process exit status.
Upgrade check-types.
Improve check.
Bump version.
Update change log.
Improve check.
Bump version.
Update change log.