Box-python-sdk

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- The SDK now supports setting a password when creating a shared link.

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**Bugfixes**

- Fixed an ImportError for installs that didn't install the [jwt] extras.

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- Added support for Box Developer Edition. This includes JWT auth (auth as enterprise or as app user),
and ``create_user`` functionality.
- Added support for setting shared link expiration dates.
- Added support for setting shared link permissions.
- Added support for 'As-User' requests. See https://box-content.readme.io/as-user-1
- Improved support for accessing shared items. Items returned from the ``client.get_shared_item`` method will
remember the shared link (and the optionally provided shared link password) so methods called on the returned
items will be properly authorized.

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- Add context_info from failed requests to BoxAPIException instances.

**Bugfixes**

- ``Item.remove_shared_link()`` was trying to return an incorrect (according to its own documentation) value, and was
also attempting to calculate that value in a way that made an incorrect assumption about the API response. The latter
problem caused invocations of the method to raise TypeError. The method now handles the response correctly, and
correctly returns type ``bool``.

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- Added support for the Box accelerator API for premium accounts.

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- Added support for preflight check during file uploads and updates.