Fix zip uploads and downloads
Add allowDataDeletion option to create XML
Merge branch 'master' of https://github.com/pyxnat/pyxnat

Conflicts:
	pyxnat/core/resources.py
Add zip for testing
Add test for zip upload and download
Update httplib
Merge branch 'bud42-master'
Pull request #49 Fix zip download.
Bump version number up to 9.5.1 to reflect newest changes.