Consider using wrapt with decorators

Now that we're using `@api_call` with all of our methods, they no longer can be introspected properly. For example, see http://box-python-sdk.readthedocs.io/en/latest/boxsdk.object.html#boxsdk.object.base_object.BaseObject.get .

We could potentially use wrapt (https://pypi.python.org/pypi/wrapt) to fix this. See https://github.com/GrahamDumpleton/wrapt/tree/develop/blog for more info.

Though this would potentially slow down the SDK code, so it might or might not be worth it. Perhaps it can be enabled when generating docs or using the terminal, but disabled otherwise.

从 @api_call 装饰器开始，将文档中记录的 BaseObject.get 行为与链接文档中描述的内省问题进行比较。阅读所引用的 wrapt 资料，然后确定保留内省是否值得 SDK 可能产生的性能成本，以及文档使用和终端使用的行为是否应有所不同。

由索引模型根据 Issue 内容生成。