Support non-Bson queries with explicit "$query" field. Fixes #648.

Note that this introduces a memory allocation in case of MongoCursor.sort() being used.
Add vibe.core.concurrency.thisTid.
Fix the assertion error message when calling Task.join outside of the event loop.
Fix assertion error message when calling Task.interrupt from outside of the event loop. See #443.
Add a timeout based overload of UDPConnection.recv. Fixes #540.
Add toString method to HTTPResponse / HTTPRequest for user convenience
Unittests script was wrong \(my bad\)
Enable Task.join/interrupt to work outside of the event loop for tasks of the same thread. See #443.

This makes it possible to use those functions outside of a task before the event loop has started, or when the event loop is manually run using processEvents().
fix issue #653
Merge pull request #651 from BoapNet/fix-tests

Fix unittests
Merge pull request #654 from japplegame/fix#653

Enable BSON serialization of const objects with toBson() methods. Fixes #653.
Add unit test for serializing const objects to BSON. See #654.
Use HTTPRequest / HTTPResponse toString methods
Minor typos
Merge pull request #650 from BoapNet/pretty-printer

Add toString to http.common.HTTPRequest / HTTPResponse