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Add preflight option for updating files

Add tests for preflight upload/update.

Improve search endpoint.

Include support for type and content_types fields.

Add support for searching by metadata value (Fixes #36)

- rename mdfilters to metadata_filters
- add check for range filter that either gt or lt is set
- move metadata filter factory to Search object

Add support email instructions to README

Add preflight option to update_contents_with_stream and update_contents,
so files can be updated with optional preflight check before actually
uploading all the bytes.

Modify Translator to return BaseObject by default, not None.

Fixes #31.

Add preflight

Both will call the _preflight_check in Item, but with different
parameter based on if it's in Folder (new file upload) or in File
(updating existing file on Box).

fix collaboration role values

- based on https://developers.box.com/docs/#collaborations-collaboration-object
  and my own development testing the values should be lowercase and the
  uploader-combo roles should have a space instead of a hyphen.

Item is a good place to host preflight method since it's parent of
both File and Folder and preflight is used only for file update (in File)
and new file upload (in Folder).

Allow importing OAuth2 from boxsdk.

It's not being used at this moment. And it's failing pylint.

I will add preflight to file update and file upload in later PRs.

Fix typo in docs, cosmetic noops

Bump version to 1.1.0.

Add HISTORY file to track changes.

Add "readme" tox target to regression test README.rst.

Add support for metadata.