alpaca

Is there an existing issue for this?

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Is your feature request related to a problem? Please describe.

Having docstrings for all methods and classes will help new contributors understand the codebase and also provide a method of autogenerated API docs. Right now only some methods and classes have docstrings.

Describe the solution you'd

Allow users to pass in data instead of requesting it through passed in Alpaca. This would benefit us in 2 ways:

1. Most importantly, users would not have to pass in their authenticated Alpaca object into the package. Instead, they can fetch the data themselves then pass it in, and we never touch Alpaca.

2. Allow users to retrieve data from sources outside of Alpaca to use for testing.

For