provide a pointer to the existing test scripts

[Robert Oostenveld]

@coalsont I mentioned some existing test scripts. You can find them here

https://github.com/robertoostenveld/fieldtrip/blob/master/test/test_bug2096.m
https://github.com/robertoostenveld/fieldtrip/blob/master/test/test_bug2734.m
https://github.com/robertoostenveld/fieldtrip/blob/master/test/test_bug2741.m
https://github.com/robertoostenveld/fieldtrip/blob/master/test/test_bug2893.m
https://github.com/robertoostenveld/fieldtrip/blob/master/test/test_bug2909.m

Especially the 2096 test script has a lot of cases. Please review them and let me know whether you want to have a copy of any of the data (which I'll share through a private channel).