Support python 3.4
The current codebase (master) doesn't seem to support python 3.4. When trying to run gajim with python 3.4, I got "can use starred expression only as assignment target" errors in gajim/common/logger.py; when I fixed them, I got "'module' object has no attribute 'module_from_spec'" error in gajim/emoticons.py. I fixed that too, and now I get "g_menu_item_set_detailed_action: Detailed action name 'app.accountname(withparentheses)-add-contact' has invalid format" (but that doesn't look related to python version).
I have python 3.4 (more specifically, 3.4.5) because currently this is the stable version of python 3.x in Gentoo.
If I manage to get it running, I'll provide a patch or a merge request.