works correctly

startup and account login

classes defeined in connection_handlers.py

'connecting'

double connections

auto_authorization is now keept in mem. This way it works correctly, but doesn't if you close gajim before your contact ask your auth. Fixes #1630

don't ask twice the password when we create an account and show correct page in vcard even we receive an empty vcard. Fixes #1560

we now keep last_status_time, show it in tooltip and information window, ask it (jabber:iq:last, JEP-0012) when we open information window. Fixes #1133

still there are several TODOs

Removed threads and mutexes in connection.py
and gajim.py.
Add resolver through nslookup command, removed
dnspython and pydns (for now).