Ox3apiclient

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* Added: HTTP and HTTPS proxy support.
* Fixed: JSON support for Python 2.4 and 2.5
* Fixed: OAuth support for Python 2.4
* Fixed: Version number below (0.2.1)

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Added: `upload_creative` to support uploading creative files.

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* Fixed: JSON parse error when deleting objects with call to `Client.delete()`
* Added: "Official" support for Python 2.4, 2.5, 2.6
* Added: `logon` and `logoff` convenience methods.
* Added: `client_from_file` to load credentials from a config file.
* `OX3APIClient` is deprecated; use `Client` instead.

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* "Official release"