v0.3.3

Maintenance release:

• no changes in functionality (only tempdir package added directly to simplify conda packaging)

v0.3.2

Import of scipy.ndimage is optional and absence of scipy will not prevent a module import.

v0.3.1

Bugfix release (no API changes).

• Fixes writing of OpenDX files (issue #21)

v0.3.0

Clean up with new formats and Python 3 compatibility.

• Python 3 compatible
• CCP4 format added
• unit tests and coverage added