build object list manually in order access model properties
added get_properties_from_model function
implemented property field display and filtering
fixed ajax_get_fields to get model classes (not instances)
change property search values into strings (for boolean comparison, etc)
added support for datetime searches on properties
fixed aggregates (but need to optimize)
get all results from aggregates values_list prior to building objects_list (otherwise need to run query for each object)
fixed aggregate display
fixed property filtering
Merge pull request #6 from SacNaturalFoods/master

Looks good to me
implemented properties filtering and display
added Report.slug field
using STATIC_URL in template
separated general ORM query filtering from report_to_list into Report.get_query
fixed average aggregation
optimization tweaks
forgot testing comment
added DisplayField.total for displaying report totals
implemented logic for displaying report totals
fixed report totals - increment from 0