[Commotion-admin] [mlab-browser-ext] Add individual test plugin preferences (#25)

[critzo]

Provide additional preferences:
* clear test data for this test
* export test data for this test 

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Reply to this email directly or view it on GitHub:
https://github.com/opentechinstitute/mlab-browser-ext/issues/25#issuecomment-57913198
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