Merge pull request #92 from authmillenon/test_cc2420

Test cases for setting and getting of cc2420 and at86rf231 config
remove stale test_vtimer_msg
Merge pull request #94 from LudwigOrtmann/vtimer_msg

remove stale test_vtimer_msg
Specify 6LoWPAN plugtests
Implement 6LoWPAN plugtests
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