Pygbif

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- fixed a bug in building the documentation with readthedocs :issue:`138`, :issue:`129`
- tests now run against live GBIF APIs :issue:`101`, :issue:`128`
- updated caching.py since the ``remove_expired_responses`` method is deprecated. :issue:`126`

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- added support for predicates: ``isNull``, ``isNotNull``, ``in`` and ``not`` :issue:`92`, :issue:`102` and :issue:`103`
- added support for nested queries/dictionaries :issue:`104`
- deprecated the ``add_predicate`` function and added ``add_pred_dict`` to accomodate for newly supported predicates to ensure that the arguments that are sent are added in the payload function :issue:`108`
- added support for multiple download formats :issue:`105`
- updated operators and look-up tables :issue:`107`
- included documentation on newly supported predicates and dictionaries :issue:`106`

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- update to fix requesting GBIF downloads
- minor documentation updates :issue:`95` and :issue:`99`

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- update to fix broken dependencies :issue:`93`
- minor documentation updates

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- Fix for `occurrences.download` when giving `geometry` as a string rather than using `add_geometry`; predicates were being split on whitespace, which doesn't work for WKT :issue:`81` :issue:`84`
- Moved to using the `logging` module instead of `print()` for giving information on occurrence download methods :issue:`78`
- Clarify that `occurrences.count` for length 1 inputs only; see `occurrences.search` for > 1 value :issue:`75` :issue:`77`
- Improved documentation for `species.name_usage` method, mostly for the `language` parameter :issue:`68`
- Gains download method `download_cancel` for cancelling/deleting a download request :issue:`59`

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- `occurrences.search` now supports `recordedByID` and `identifiedByID` search parameters :issue:`62`
- clean up the Contributing file, thanks niconoe :issue:`64`
- clean up internal imports in the library, thanks niconoe :issue:`65`
- fix usage of `is` and `==`, was using them inappropriately sometimes (via https://realpython.com/python-is-identity-vs-equality/), :issue:`69`
- remove redundant parameter in a doc string, thanks faroit :issue:`71`
- make a test for internal fxn `gbif_GET_write` more general to avoid errors if GBIF changes content type response header slightly :issue:`72`