Use a better "skip" name for test

beat/core/test/test_plotter.py

@@ -90,7 +90,7 @@ def test_plot_png():
     #with open('test.png', 'wb') as f: f.write(fig)
 
 
-def no_test_plot_jpeg():
+def skip_plot_jpeg():
     # disabled test: matplotlib on 'defaults' is not compiled against libjpeg
     fig = do_plot('image/jpeg')
     nose.tools.eq_(imghdr.what('test.jpg', fig), 'jpeg')