use safe_repr to print arg vals in trace

This fixes a problem in which extremely long (and slow) stack traces would be produced when
function parameters are large numpy arrays.
FIX: hide the temporary files from other users under Unix
Merge pull request #91 from dstahlke/reprfix

use safe_repr to print arg vals in trace
Add more doc / comments on the max_nbytes behavior
ENH: make memory respect mmap_mode at first call too
Merge pull request #95 from ogrisel/memory-mmap-mode

ENH: make memory respect mmap_mode at first call too
ENH: ThreadPool-based backend for GIL-releasing tasks
Update changes
FIX: heisen test failure in pre_dispatch test
FIX: Use public daemon flag that works from Py 2.6 to 3.4+
FIX: remove deprecation warning that can cause doctest failure
TST: test_simple_parallel was no testing want expected
FIX #97: Pickler.save_global API has changed in Python 3.4
FIX #94: memoryview are less robust on Python 3.2
Merge pull request #100 from ogrisel/py32-memoryview-hashing

[MRG] FIX #94: memoryview are less robust on Python 3.2
FIX #96: clean temporary files in test fixtures
FIX: support the new Python 3.4 multiprocessing API
Merge pull request #99 from ogrisel/python34-multiprocessing

[MRG] supporting the new Python 3.4 multiprocessing API
Update CHANGES.rst to add Python 3.4 support
REL: 0.8.0a