Implement reading from the serial port. Better error checking#3

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xseignard merged 4 commits intoxseignard:masterfrom

elafargue:master

Mar 23, 2014

Commits on Mar 20, 2014

Implement serial reading. Documentation to come.
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Commits on Mar 21, 2014

Do not die if we try to close a port that was not opened previously.
elafargue
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Commits on Mar 22, 2014

Rather than just die, handle read and write to a closed port nicely by
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Restore README contents and add doc for the read() call
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