Periodic commit when Dispersy doesn't exist.
No longer using Callback thread when Dispersy is disabled.
Now 'correctly' using the private _db member from outside the instance.
Merge pull request #139 from boudewijn-tribler/bugfixes

Periodic commit when Dispersy doesn't exist.
Merge branch 'devel' of ssh://git@github.com/Tribler/tribler into
core_cleanup

Conflicts:
	Tribler/Core/APIImplementation/LaunchManyCore.py