Box-python-sdk

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- Added support to the search endpoint for metadata filters.
- Added support to the search endpoint for filtering based on result type and content types.

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- Added support for the /shared_items endpoint. ``client.get_shared_item`` can be used to get information about
a shared link. See https://developers.box.com/docs/shared-items

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**Bugfixes**

- Certain endpoints (e.g. search, get folder items) no longer raise an exception when the response contains items
that are neither files nor folders.

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- A minor change to namespacing. The ``OAuth2`` class can now be imported directly from ``boxsdk``.
Demo code has been updated to reflect the change.

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**Features**

- The SDK now supports Box metadata. See the `metadata docs <https://developers.box.com/metadata-api/>`_ for
more information.

- The object paging API has been improved. SDK extensions that need fine-grained control over when the next "page"
of API results will be fetched can now do that.

**Example Code**

- The example code has been improved to be more robust and to work with all Python versions supported by the SDK
(CPython 2.6-2.7, CPython 3.3-3.4, and PyPy).

- The example code has an example on how to use the new metadata feature.

- The README has improved code examples.

**Bugfixes**

- Oauth2 redirect URIs containing non-ASCII characters are now supported.