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* minor refactoring
* official support for django 1.4 to 1.9
* official support for python 2.7, 3.3, 3.5
* merge :ghissue:`77` - add initial form values for CSV export
* merge :ghissue:`76` - reuse xls style while iterating over cells
* merge :ghissue:`75` - allow streaming export to CSV response
* merge :ghissue:`73` - Fixing merge on DateTimeField with null=True
* support settings.ADMINACTIONS_CSV_OPTIONS_DEFAULT
* support streaming CSV file response
* new `upper` and `lower` modifiers available for EmailField in mass update.