This is ultimately to remove assumptions about what is being plotted from
the plotting function.

Use 'plot' instead of 'fig', which can be confused with matplotlib
figure.

and update README

closes #6

This utilizes matlab.engine to run MATLAB gwinc on it's default IFOModel.
The resultant data (ifo and noises) are saved to gwinc.mat file, which is
then loaded by the test command.  The loaded ifo parameters are used to
create a pygwinc ifo model, from which pygwinc noises are calculated.

The difference between the matgwinc and pygwinc noises are then plotted
and displayed.b

Reproduces the Voyager noise curves but still needs testing with other IFO models.