Merge pull request #2550 from joferkington/fix-wx-singleshot-timer

Using a single-shot timer with the Wx backend raises an AttributeError
AffineBase.__eq__ should not raise an exception when the other does not have "is_affine" attribute.
Merge pull request #2581 from leejjoon/affine_base_eq

AffineBase.__eq__ should not raise an exception when the other does not ...
Merge pull request #2584 from magnunor/fix_legend_typo

Fix typo in legend documentation
Merge pull request #2591 from dopplershift/fix-infinite-recursion

Fix infinite recursion in units with ndarray subclasses.
Merge remote-tracking branch 'upstream/v1.3.x'