Update TrialCircularBuffer.cpp

Include <unistd.h> line 31 for a smooth make on Linux for usleep()
Update RHD2000Thread.cpp

getting the fast settle running ....
Update rhd2000evalboard.cpp

get the settling running ....
Update rhd2000evalboard.h

get the settling running ...
Merge pull request #150 from AGenews/spikesorting

Update TrialCircularBuffer.cpp