Changes

tsk32 Adds a view for invite teams to a competition and delete
invitations
In order to allow a user to invite teams to participate in his
competitions, this view will allow the user to find public visible teams
and invite them to participate to a concrete competition (a competition
managed by the user). Also, if a team was invited, the user can delete
the invitation. By default the teams will be filtered by the competition
Sport Type, and will bring to the user the possibility to filter them by
name and description.