small comment

Conflicts:
	examples/opf/clients/cpu/cpu.py

use pyplot instead of pylab

matplotlib.pyplot is a standart part of matplotlib, while pylab isn't

Conflicts:
	examples/opf/clients/cpu/cpu.py
add legend, labels to graph plot

matlab style plots
allow to close window and exit
remove offending line

strange, I thought it's standart mpl method. Anyway, it was just experimental. no harm to remove
Partial revert as fignum_exists doesn't exist on plt
Merge pull request #247 from oxtopus/cpu_predictor_plots

Cpu predictor plots
Merge branch 'master' into modular-matplotlib