refactor Project test
Merge branch 'master' of https://github.com/buildbuild/buildbuild
update Project
Add team field validation code about contact number & website url
modifying invalid long length variables. (ex : "aaa....a"    to     "a" * numbers)
Resolve m2m relationship in waitList & add default test file for wait list
Merge branch 'feature/Team_Apply' of https://github.com/wikibootup/buildbuild into feature/Team_Apply

Conflicts:
	buildbuild/teams/tests/test_team_manager.py
refactor Project model & test
update requirements.txt : add celery
add celery module
update requirements.txt : add django-celery
update settings.py : add djcelery in INSTALLED_APPS
update settings.py : django-celery setting for DB
fix settings.py : import should be on the top
Merge branch 'feature/integrate-celery' into develop

* feature/integrate-celery:
  fix settings.py : import should be on the top
  update settings.py : django-celery setting for DB
  update settings.py : add djcelery in INSTALLED_APPS
  update requirements.txt : add django-celery
  add celery module
  update requirements.txt : add celery
add test code for Wait List
add validation code on get_user (email)
Add WaitList Manager, and it's method (append to list, get list)
Add delete code for WaitList & divide method to check target is in WaitList
add Test code for delete from Wait List