Running the doc notebook for `WaveBank` modifies the 'crandall_test' dataset?

[shawnboltz]

I'm not going to call this a bug, per se... just want to make a note of it and a workaround.

When you run the doc notebooks locally, specifically the one for WaveBank, it adds the default obspy stream to the 'crandall_test' dataset. This isn't really an issue, especially because I don't think it would impact a significant number of people, other than the fact it then causes one of the tests for WaveBank to fail.

If anyone comes across this, a simple workaround is to delete the 'crandall_test' dataset and force it to redownload.