some documentation and tests added for the gui new features

Author: fsalmoir

pygem/igeshandler.py

@@ -219,6 +219,9 @@ def plot(self, plot_file=None, save_fig=False):
 		:param string plot_file: the iges filename you want to plot.
 		:param bool save_fig: a flag to save the figure in png or not. If True the
 			plot is not shown.
+			
+		:return: figure: matlplotlib structure for the figure of the chosen geometry
+		:rtype: matplotlib.pyplot.figure
 		"""
 		if plot_file is None:
 			plot_file = self.infile

pygem/stlhandler.py

@@ -88,7 +88,8 @@ def plot(self, plot_file=None, save_fig=False):
 		:param bool save_fig: a flag to save the figure in png or not. If True the
 			plot is not shown.
 			
-		aggiungere return
+		:return: figure: matlplotlib structure for the figure of the chosen geometry
+		:rtype: matplotlib.pyplot.figure
 		"""
 		if plot_file is None:
 			plot_file = self.infile