shell cmd: no output from stderr

[WaveHack]

Originally reported by: Anonymous

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Octavia	PinkieBot: cmd echo foo > /dev/stdout
PinkieBot	Octavia: foo
Octavia	PinkieBot: cmd echo foo > /dev/stderr
PinkieBot	Octavia: 

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• Bitbucket: https://bitbucket.org/WaveHack/pinkiebot/issue/25

[WaveHack]

Original comment by WaveHack (Bitbucket: WaveHack, GitHub: WaveHack):

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Formatted.