JZ: Relocate import csv tests & fixtures
JZ: Add celery task wrapper & progress polling fx
JZ: Add csv_import task to celery imports
JZ: CSVimport view to handle async & sync import

Based on csv row count
JZ: Fix style test fail
JZ: Fix async csv imports and polling
JZ: Fix typo chech => check
JZ: Specify csv import task for celery
DW: Owner cannot remove self from project if there is no other owner
DW: Corrected flake8 issues
DW: Checks if user is less or equal to one