Merge pull request #540 from divanvisagie/master

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emit errors instead of calling process.exit()

Improvement to #520 error handling
emit errors instead of calling process.exit()

Improvement to #520 error handling
Merge branch 'emit-error' of github.com:Resseguie/johnny-five into emit-error

Conflicts:
	lib/board.js
multi board ready test

Fixes #533
Merge pull request #542 from Resseguie/multiboard-test

multi board ready test
Merge pull request #541 from Resseguie/emit-error

emit errors instead of calling process.exit()