PLT-2863 adding remove user from team (#3429)

* PLT-2863 adding remove user from team

* PLT-2863 adding the client side UI

* Fixing trailing space

* Fixing reported issues

* Adding documentatino

* Switching to final javascript driver

store/sql_team_store.go

@@ -41,6 +41,7 @@ func NewSqlTeamStore(sqlStore *SqlStore) TeamStore {
 }
 
 func (s SqlTeamStore) UpgradeSchemaIfNeeded() {
+	s.CreateColumnIfNotExists("TeamMembers", "DeleteAt", "bigint(20)", "bigint", "0")
 }
 
 func (s SqlTeamStore) CreateIndexesIfNotExists() {