update requirements

bug 846349

Updates the following requirements:

bleach
boto
chardet
django-aesfield
django-browserid
django-extensions
django-multidb-router
django-waffle
djangorestframework
easy-thumbnails
email-reply-parser
google-api-python-client
html5lib
MySQL-python
pyelasticsearch
pytz
recaptcha-client
receipts
redis
six
suds

Removes the following unused requirements:

django-picklefield
django-ratelimit
python-mimeparse
unrot command to exclude unrated games