Status of worker spawning

Each worker can now optionally pass a status message to the master. The
master will then log when each worker is ready, and when all workers are
ready.

Test via: node test/ready.js
Merge branch 'master' of github.com:ifit/optimus into status

Conflicts:
	index.js
upping version
adding ready method
Merge pull request #3 from ifit/status

Status of worker spawning