Update mwclient to 0.8.4 for fetch sound from wiktionary
Review Request #130020 - Created March 16, 2017 and submitted
Update mwclient to 0.8.4 for fetch sound from wiktionary,
because wiktionary no longer support HTTP APIs.
Also add following packages used by mwclient:
add init.py for six package
Revision 2 (+4305 -7217)
Import six.py directly because when importing as a package, (__init__.py: from .six import *) there are weird import errors.
Revision 3 (+4303 -7217)