Incorrectly base64 encoded when using Cloud Storage Emulator

[jpeiffer]

I'm not sure if the issue is with this package, with the Firebase Cloud Storage emulator, or a combination of the two, but it starts here so this is where I opted to create the issue.

When using the Cloud Storage Emulator combined with this package, uploading files results them being stored as base64 encoded, preceeded by a newline.

For example, uploading a text file containing:

Hello World!

... gets stored as:

SGVsbG8gV29ybGQh

This same problem does not happen if you upload the file via the emulator UI console and it also does not happen when using a live Cloud Storage project.

To help demonstrate the problem, I created a sample repo where the tests will pass in the live environment and clearly show the problem when using with the emulator.

https://github.com/jpeiffer/cloud_storage_issue