Matplotlib docs building warnings

gistfile1.txt

  reading sources... [ 29%] examples/images_contours_and_fields/streamplot_demo_masking
/home/travis/virtualenv/python2.7.8/lib/python2.7/site-packages/numpy/ma/core.py:783: RuntimeWarning: invalid value encountered in greater_equal
  return umath.absolute(a) * self.tolerance >= umath.absolute(b)
  
  reading sources... [ 83%] examples/units/units_scatter                          
/home/travis/virtualenv/python2.7.8/lib/python2.7/site-packages/numpy/ma/core.py:3855: UserWarning: Warning: converting a masked element to nan.
  warnings.warn("Warning: converting a masked element to nan.")
/home/travis/build/matplotlib/matplotlib/doc/mpl_examples/units/basic_units.py:300: RuntimeWarning: divide by zero encountered in divide
  secs.add_conversion_fn(hertz, lambda x: 1./x)
  
  pylab_examples/set_and_get.py
  /home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/matplotlib-1.5.dev1-py2.7-linux-x86_64.egg/matplotlib/artist.py:196: MatplotlibDeprecationWarning: This has been deprecated in mpl 1.5, please use the
axes property.  A removal date has not been set.
  warnings.warn(_get_axes_msg, mplDeprecation, stacklevel=1)