Close data logfiles on disconnect

[evoggy]

We should close the log files opened in the log data writer when we disconnect

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• Bitbucket: https://bitbucket.org/bitcraze/crazyflie-pc-client/issue/101
• Originally Reported By: Marcus Eliasson
• Originally Created At: 2014-01-23T08:36:25.648

[evoggy]

Stop logging to file on disconnect. Closes #101.

→ <<cset 61cec931346f>>

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Original Comment By: Marcus Eliasson