Fantasy and cursive fonts installed on travis are no longer used correctly by docs build

[jenshnielsen]

See http://matplotlib.org/devdocs/examples/pylab_examples/fonts_demo.html and https://travis-ci.org/matplotlib/matplotlib/jobs/110829217 it seems to be ok on 2.x thou

[QuLogic]

May be related to #5998?

[QuLogic]

Possibly relevant lines:

/home/travis/build/matplotlib/matplotlib/lib/matplotlib/font_manager.py:1314:
 UserWarning: findfont: Font family ['cursive'] not found. Falling back to DejaVu Sans
  (prop.get_family(), self.defaultFamily[fontext]))

/home/travis/build/matplotlib/matplotlib/lib/matplotlib/font_manager.py:1314:
 UserWarning: findfont: Font family ['fantasy'] not found. Falling back to DejaVu Sans
  (prop.get_family(), self.defaultFamily[fontext]))

/home/travis/build/matplotlib/matplotlib/lib/matplotlib/font_manager.py:1314:
 UserWarning: findfont: Font family ['Humor Sans', 'Comic Sans MS'] not found. Falling back to DejaVu Sans
  (prop.get_family(), self.defaultFamily[fontext]))

[anntzer]

This appears to have been fixed as of master: https://matplotlib.org/devdocs/gallery/text_labels_and_annotations/fonts_demo.html.