python3

[RafaelSche]

new files: Dockerfile_py3, ansible/install_py3.yml,

• corrected imports of files in the same folder with the full path "emuvim.api...."
• element generator objects cannot be accessed by index (example: generator[5]) - fixed with cast to + list
• Exceptions have no more attribute message - fixed to str(e)
• urlparse changed to urllib.parse - try-except-block used to make it work in py2 and py3
• no more function unicode - used str instead
• changed dict member functions itervalues to values, iterkeys to keys, iteritems to items
• no more class basestring
• networkx lib change: add_edge function has no more parameter attr_dict, passed as **attr_dict instead
• In some tests changed self.assertTrue to self.assertIn to get a better error message