Issue LIBCLOUD-486: The ex_destroy_image call was renamed to ex_delete_image to adhere to libcloud standards. Ex_destroy_image will still function as expected, but will throw a deprecated warning.
Fixing identation bug within the ex_destroy_image warning.
Merge branch 'LIBCLOUD-486_Rename_Destroy_Image' of https://github.com/DivvyCloud/libcloud into LIBCLOUD-486_Rename_Destroy_Image

Conflicts:
	libcloud/compute/drivers/ec2.py