remove teams from databse

db/migrate/20160704142512_drop_teams.rb

@@ -0,0 +1,7 @@
+class DropTeams < ActiveRecord::Migration
+  def change
+    remove_column :exercises, :team_id, :integer
+    drop_table :teams
+    drop_table :internal_users_teams
+  end
+end

db/migrate/20160704143402_remove_teams.rb

@@ -0,0 +1,7 @@
+class RemoveTeams < ActiveRecord::Migration
+  def change
+    remove_column :exercises, :team_id, :integer
+    drop_table :teams
+    drop_table :internal_users_teams
+  end
+end