Fixed bug #8 due to a class in matplotlib moving place

Author: ggilestro

wxmpl.py

@@ -22,7 +22,7 @@
 import matplotlib
 matplotlib.use('WXAgg')
 import numpy as NumPy
-from matplotlib.axes import _process_plot_var_args
+from matplotlib.axes._base import _process_plot_var_args
 from matplotlib.backend_bases import FigureCanvasBase
 from matplotlib.backends.backend_agg import FigureCanvasAgg, RendererAgg
 from matplotlib.backends.backend_wxagg import FigureCanvasWxAgg