Added 'provider' query in API and new documentation
Merge branch 'master' of https://github.com/ysavary/WindMobile2-Server

# By Yann
# Via Yann
* 'master' of https://github.com/ysavary/WindMobile2-Server:
  Updated requirements.txt
  Added CORS django app

Conflicts:
	requirements.txt
	windmobile/settings.py
Updated pymongo