Changes to implement the scipy.optimize package for determining parameters.
Recording SSE values from logistic model.
Recording SSE.
Using Numpy's sum() function.
GrowthCurve.py
- Upper limit added to asymptote.

runPM
- Using Python 3.4
Merge branch 'curvefit' into develop

Conflicts:
	py/GrowthCurve.py
	py/PMData.py
	py/pmanalysis.py