Removes the dependency on constructor overloading.

The constructor overloading feature has been removed from Dispersy, we
could either remove the dependency, implement the overloading in the
constructor, or redesign to no longer require overloading.

The simplest that is still backwards compatible is to implement the
overloading in the constructor.
Dispersy.stop() now returns True or False.

The LaunchManyCore will now output information on the success of the
Dispersy shutdown.
Point to latest Dispersy.

- properly returns True/False when calling Dispersy.stop()
- Contrustor overloading has been removed
Merge pull request #268 from boudewijn-tribler/bugfixes

Bugfixes