Fixed issue with rasterized not working for errorbar

[orso82]

This pull request fixes the rasterized argument not being passed to the lines of the errorbar

[mdboom]

It looks like this just needs to be cleaned up for PEP8 (too long lines), but otherwise, I'm 👍. We should also add a test. I don't think an image comparison test will pick this up (since the rasterized version should be close enough to a non-rasterized one). But you could create an errorbar with rasterized set to True and then just introspect that get_rasterized on the artists returns True.

[tacaswell]

@orso82 Any update on this?