* Splitting out sampler.py
* Creating a struct.py
adding note about where I got the Struct code from
Lots of refactoring.  Looking a bit better now.  Mostly UNTESTED!  #22
Continuing to refactor. #22

* Sampler is now a class which inherits from threading.Thread
* scripts/plot.py works
* scripts/record.py works (but is rather ugly)
Finished refactoring. Closes #22.
Output power data to text file. closes #14