Idigbio

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**Changes**

- Make pandas an extra requirements, update docs

**New**

- Specify auth for api backend
- Upload image capability (requires auth)

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**Changes**

- Don't exclude ``data.*`` fields if requested specifically
- Fix ``stats`` and ``datehist`` api calls to respect parameters;
param names changed to use python style and match server params.

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**Bugfixes**

- no results no longer errs in the pandas client.
- limit correctly limits to specified record, not next larger batch size

**Miscellaneous**

- Clarify targetted python versions