Get rid of Fibers in honour of EventMachine since it’s already reached version 1 milestone#1

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mudasobwa wants to merge 13 commits intonegativecode:masterfrom

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Commits on Nov 24, 2012

Commits on Nov 26, 2012

Asynchronous output from executed shell commands, exitstatus (printed if !=0)
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Commits on Nov 27, 2012

Mutex for initialization was erroneously commented out.
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