pyxnat ticket 50.

remove the forwarding  on 404's in interfaces.py and refactored errors.py to us xml parsing to find messages instead of assuming that html is in a certain structure.
Merge commit 'd2f5b92b25d1b2e6eaf7735f3406fd0a608e7f6c''

Ticket #43 fix file.get_copy() error..

Disable test_nested_for_access() against OASIS project because it runs to long.
Merge branch 'master' of https://github.com/DavidJJ/pyxnat into DavidJJ-master
bump revision to 0.9.5.2
Merge branch 'DavidJJ-master'
Fixes for Ticket #50. bump version to 0.9.5.2
Description of latest changes.
Bumped revision number.