Make Django loaddata management command references consistent
Make Django loaddata management command references consistent

This changeset makes all of the `loaddata` management command calls
consistent.

kdeloach/nyc-trees,azavea/nyc-trees,kdeloach/nyc-trees,azavea/nyc-trees,maurizi/nyc-trees,maurizi/nyc-trees,kdeloach/nyc-trees,maurizi/nyc-trees,kdeloach/nyc-trees,azavea/nyc-trees,maurizi/nyc-trees,kdeloach/nyc-trees,azavea/nyc-trees,azavea/nyc-trees