Add 8 of 9 regions of England; except London as it is already available

Add following regions:
gb_england_east-midlands.poly
gb_england_east-of-england.poly
gb_england_north-east.poly
gb_england_north-west.poly
gb_england_north-yorkshire-and-the-humber.poly
gb_england_sout-east-of-england.poly
gb_england_south-west-england.poly
gb_england_west-midlands.poly