Added documentation for the python classes Point and PersistenceDiagram. Removed the __sub__ method for PersistenceDiagram. Minor renaming.
Renamed BottleneckDistance to bottleneck_distance.
Renamed intervals iterator for PersistenceDiagram to points. Seems in better conformance with usage.
def setup(app):
app.add_javascript('jsMath/plugins/spriteImageFonts.js')