* python/Makefile.am: Break on pyrexc errors instead of ignoring them

* python/Makefile.am: Break on pyrexc errors instead of ignoring them

* python/dbus_bindings.pyx: Memory management foo
(global): remove hacky _user_data_references global list
(GIL_safe_cunregister_function_handler): userdata now stuffed into
tuples. Unref user_data
(GIL_safe_cmessage_function_handler): userdata now stuffed into tuples
(Connection::__del__): Remove and replace with __dealloc__ method
(Connection::add_filter): Stuff user_data into a tuple.  Use Py_INCREF
to keep tuple from being deallocated instead of the global var hack
(Connection::register_object_path): Stuff user_data into a tuple.
Use Py_INCREF to keep tuple from being deallocated instead of the
global var hack
(Connection::register_fallback): Stuff user_data into a tuple.
Use Py_INCREF to keep tuple from being deallocated instead of the
global var hack
(GIL_safe_pending_call_notification): Don't unref the message
because it gets unreffed when going out of scope.  Py_XDECREF
the user_data
(PendingCall::__del__): Remove and replace with __dealloc__ method
(PendingCall::set_notify): ref the pending call because we will
need it to stick around for when the notify callback gets called
(Message::__del__): Remove and replace with __dealloc__ method

* python/dbus_glib_bindings.pyx (init_gthreads): Changed to
gthreads_init to match up with the dbus call

* python/glib.py (init_threads): Changed to threads_init to match
up with gobject.threads_init().  init_threads is kept for backwards
compat but will most likely be deprecated in the future

* test/python/test-client.py:
- revamp to use Python's unittest functionality
- add async call tests
- setup threads in glib and dbus so we make sure locks are working