Silence NumbaWarnings in the test suite on Python 3.4
Fix #689: sporadic errors could be written out at shutdown by the Dispatcher finalizer
Backport weakref.finalize() and use that, instead of a custom deallocation hook in _dispatcher.c
Merge pull request #693 from pitrou/warnings-34

Silence NumbaWarnings in the test suite on Python 3.4
Merge pull request #694 from pitrou/fix689

Fix #689: sporadic errors could be written out at shutdown by the Dispat...
Merge branch 'master' of github.com:numba/numba into timedelta64