Non blocking bootstrap address resolving.
Merge remote-tracking branch 'remotes/tribler/devel' into blocking-gethostbyname

Conflicts:
	dispersy.py
Don't block when called from the working thread.
Always shutdown the temp-tracker.
Improved debug output.
Tweak for fast starting.
Fixes referenced before assignment bug.
Merge pull request #138 from boudewijn-tribler/blocking-gethostbyname

Blocking gethostbyname