Minor fixes

[brl0]

Closes #34, #35, #36

If possible, and if this is accepted, it would be helpful to cut a new release once merged.

[jbednar]

Thanks! Looks good to me!

[jbednar]

I'm happy to merge once the tests pass, but on first glance I can't see what those test failures are about. Probably unrelated to this PR, but still seem like they need addressing.

[tylerpotts]

@jbednar Would it be possible to merge this anyways and cut a release despite the tests failing? We rely on one of the bug fixes in this PR and currently are pip installing from the git hash

[brl0]

Fixes #41 and #42, along with a couple of other minor issues. All tests should be passing now.

[jbednar]

Thanks so much! I'll tag a dev release.

[jbednar]

Tagged: https://github.com/holoviz/spatialpandas/releases/tag/v0.3.5a0

For our other projects, tagging is all that's required for making a release, with the release process automated on Travis. It looks like none of that has been set up on this library yet, so I don't actually know what the process is for making pip and conda packages appear for spatialpandas. @jlstevens, any suggestions?