allow adding the same property filter field multiple times
added DisplayField.format attribute and migration
started adding format form field
fixed datepicker class form field logic
added DisplayField.display_format 1-to-1 field
added ajax_get_formats view for DisplayField.display_format drag and drop
completed DisplayField.display_format functionality
commit
Removed needless comment
Merge branch 'master' of git://github.com/SacNaturalFoods/django-report-builder
Added help_text for format string