Added waitlist_teams table and model file

change migration to have primary key

…into schidar

LGTM

…ist_methods

changed schema, and added create/delete waitlist

…ist_methods

added more methods and fixed num on waitlist colum

…list_methods

migrate waitlists from signed_up_teams to waitlist_teams

Added methods to handle deletion cases

Check if team is waitlisted for other topic before signup

…into amengan

Release signup and waitlist Functionality , WaitlistTeam RSpec

… and waitlist_team.rb

… and waitlist_team.rb

…ggestion_controller.rb

Changes for synchronizing waitlist features with invitation.rb and suggestion_controller.rb

…into krishnasaurabh_add_waitlist_methods

…list_methods

Fix waitlist views

Rspec test cases for waitlist_team.rb

Added comments in waitlist_team.rb model file

…list_methods

Fix rubocop issues

fixed typos and rubocop issues

…list_methods

fixed rubocop issues and Waitlist class references

Resolving failing test cases in signup sheet spec