BLD: ipython_directive, enforce tight layout for mpl plots

Author: y-p

doc/sphinxext/ipython_directive.py

@@ -489,7 +489,9 @@ def save_image(self, image_file):
         Saves the image file to disk.
         """
         self.ensure_pyplot()
-        command = 'plt.gcf().savefig("%s")'%image_file
+        command = ('plt.gcf().savefig("%s", bbox_inches="tight", '
+                   'dpi=100)' % image_file)
+
         #print 'SAVEFIG', command  # dbg
         self.process_input_line('bookmark ipy_thisdir', store_history=False)
         self.process_input_line('cd -b ipy_savedir', store_history=False)