matplotlib Code

added draft outline

added api histogram demo which comments on the new bins return value

Add newline to end of file.

Close polygons.

Add some CSS so that there are lines above classes and methods in the
auto-generated docs.

Fix dpi-changing-related bugs in Axes.scatter()

Fix one-pixel space between images and axes border.

fixed collection demo to remove deprecated dpi

Forgot to commit this file

tried to fix some api table formatting problems but these apparently were not the ones triggering the sphinx doc warnings. we need to figure out a way to make sphinx generate some context in its api warnings since the line numbers are not helpful