Added redo_migration function that redoes a certain tag by doing down/up.
Added redo_migration function that redoes a certain tag by doing down/up.

yunkai/ChicagoBoss,aherranz/ChicagoBoss,frkarl/ChicagoBoss,powermedia/ChicagoBoss,7i11/ChicagoBoss,powermedia/ChicagoBoss,solatis/ChicagoBoss,aherranz/ChicagoBoss,uselessd/ChicagoBoss,uselessd/ChicagoBoss,frkarl/ChicagoBoss,lamptt/ChicagoBoss,yunkai/ChicagoBoss,solatis/ChicagoBoss,lamptt/ChicagoBoss,danikp/ChicagoBoss,synlay/ChicagoBoss,synlay/ChicagoBoss,7i11/ChicagoBoss,danikp/ChicagoBoss,ChicagoBoss/ChicagoBoss,ChicagoBoss/ChicagoBoss