Propagate axios errors 236

[byronmurg]

Overview

When calling an *AsStream method a client needs to handle errors
raised by couch. These errors can include retrieving an attachment
that doesn't exist or querying a deleted view.

Testing recommendations

The easiest way to test is to try retrieving an attachment that doesn't exist.

e.g.

alice.attachment.getAsStream('rabbit', 'doesntexist.png')
  .on('error', (e) => console.error(e))
  .pipe(/* handle stream */)

GitHub issue number

Fixes issue #236.

There are likely other issues that are affected by this, but 236 is the most recent.

Related Pull Requests

Checklist

• Code is written and works correctly;
• Changes are covered by tests;
• Documentation reflects the changes;

The material changes are covered by the tests however I am unable to get nock errors to emit with isAxiosError.

[glynnbird]

Great work. Thanks for taking the time to look at this. If you could fix up the ...AsStream documentation errors too that would be great. If you don't have time, let me know and I'll fix them separately.

[glynnbird]

Thanks!