Additional Features and Bug Fixes

Merge remote-tracking branch 'origin/master'

# Conflicts:
#	webwhatsapi/__init__.py

Python 3 Support + Multiple new features

Merge pull request #113 from alfred82santa/master

Fixes & first steps in order to download encrypted files

More fixes

Merge pull request #26 from adhikasp/unread_msg

get_unread_message: Fix reading sent message as unread

Core Bug Fixes

Merge pull request #26 from adhikasp/unread_msg

get_unread_message: Fix reading sent message as unread