Remove swagger (#659)

Reminders:
- `kagglesdk` is generated by `kapigen` -- no review needed
- The `kaggle` directory is a copy of `src/kaggle` -- no need to review
both

Author: stevemessick

docs/README.md

@@ -1,5 +1,8 @@
 # Kaggle API
 
+CAUTION: Most of the files in this directory are obsolete and will be deleted. This file is valid,
+as are `model_card.md`, `modelinstance_usage.md`, and `models_metadata.md`.
+
 Official API for https://www.kaggle.com, accessible using a command line tool implemented in Python 3.  
 
 Beta release - Kaggle reserves the right to modify the API functionality currently offered.

kaggle/__init__.py

@@ -14,10 +14,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# coding=utf-8
-from __future__ import absolute_import
-from kaggle.api.kaggle_api_extended import KaggleApi
-from kaggle.api_client import ApiClient
-
-api = KaggleApi(ApiClient())
-api.authenticate()
+# coding=utf-8
+from __future__ import absolute_import
+from kaggle.api.kaggle_api_extended import KaggleApi
+
+api = KaggleApi()
+api.authenticate()