We Should Use the ID in the Error Returned By Box When Updating a File

This fixes an issue with folders having more than 100 files in them:

This is what the exception returned by box looks like when a file already exists:

"{\"type\":\"error\",\"status\":409,\"code\":\"item_name_in_use\",\"context_info\":{\"conflicts\":[{\"type\":\"file\",\"id\":\"6626917134\",\"sequence_id\":\"0\",\"etag\":\"0\",\"sha1\":\"9624681564c056c8c25e83b31318ad5b2899615d\",\"name\":\"\\u043a\\u0443\\u0437\\u043d\\u0435\\u0446\\u043a\\u0438\\u0439_\\u2116nana.jpg\"}]},\"help_url\":\"http:\\/\\/developers.box.com\\/docs\\/#errors\",\"message\":\"Item with the same name already exists\",\"request_id\":\"8226856255131143079ff8\"}"