move project out of 'mwclient' directory

README.txt

REFERENCE.txt

RELEASE-NOTES.txt

__init__.py

client.py

compatibility.py

errors.py

ex.py

http.py

listing.py

page.py

page_nowriteapi.py

tests/basic_edit_test.py

tests/test-image.png

tests/upload_api_test.py

upload.py