IssueTracker

I upgraded my lib directory with pip -r requirements.txt -t lib -U and got the following error when trying to run my standard app engine:

```
ERROR    2017-12-09 10:58:13,309 wsgi.py:263]
Traceback (most recent call last):
  File "/home/XXXX/google-cloud-sdk/platform/google_appengine/google/appengine/runtime/wsgi.py", line 240, in Handle
    handler = _config_handle.add_wsgi_middleware(self._LoadHandler())
  File "/home/XXXX/google-cloud-sdk/platform/google_appengine/google/appengine/runtime/wsgi.py", line 299, in _LoadHandler
    handler, path, err = LoadObject(self._handler)
  File "/home/XXXX/google-cloud-sdk/platform/google_appengine/google/appengine/runtime/wsgi.py", line 85, in LoadObject
    obj = __import__(path[0])
  File "/home/XXXX/zzz/std_watcher_runapp.py", line 10, in <module>
    from flask import Flask, current_app, jsonify, url_for, request
  File "/home/XXXX/zzz/lib/flask/__init__.py", line 17, in <module>
    from werkzeug.exceptions import abort
  File "/home/XXXX/zzz/lib/werkzeug/__init__.py", line 151, in <module>
    __import__('werkzeug.exceptions')
  File "/home/XXXX/zzz/lib/werkzeug/exceptions.py", line 71, in <module>
    from werkzeug.wrappers import Response
  File "/home/XXXX/zzz/lib/werkzeug/wrappers.py", line 37, in <module>
    from werkzeug.formparser import FormDataParser, default_stream_factory
  File "/home/XXXX/zzz/lib/werkzeug/formparser.py", line 14, in <module>
    from tempfile import SpooledTemporaryFile
ImportError: cannot import name SpooledTemporaryFile
```

my app.yaml is the following:

Flask==0.12.2
google-api-python-client==1.6.4
google-auth==1.2.1


Forcing werkzeug to stay one version below latest one fixes the issue

werkzeug==0.12.2