Update urls.py
add test code for TeamManager's create_team
add Test code for get_all_teams & implementation code for model
add test code about get_team & implementation pulling team name
Add test code for Validation team name & implementation about team name in case of max length 30
Merge pull request #19 from wikibootup/feature/Team_Apply

Team Manager minor Feature(create, get all, get) for applying team