restored missing grunt-shell dependency
restored missing grunt-shell dependency

tboyce/tsd,abner/tsd,nlunets/tsd,germ13/tsd,tboyce/tsd,Diullei/tsd,frankwallis/tsd,tboyce/tsd,DefinitelyTyped/tsd,IgorMinar/tsd,nlunets/tsd,Diullei/tsd,perkastman/tsd,Diullei/tsd,IgorMinar/tsd,nlunets/tsd,germ13/tsd,IgorMinar/tsd,frankwallis/tsd,kyroskoh/tsd,frankwallis/tsd,kyroskoh/tsd,DefinitelyTyped/tsd,perkastman/tsd,germ13/tsd,abner/tsd,DefinitelyTyped/tsd,kyroskoh/tsd,abner/tsd,perkastman/tsd