Add -rr/--reverse-relative option (issue #417)

[jpgrayson]

This new option changes the sort order of relative imports. The new default
sort order is from furthest to closest (most dots to least dots):

from ... import a
from ...foo import x
from .. import b
from ..bar import y
from . import c
from .baz import z

With the new -rr/--reverse-relative option, the order of the relative
import levels (inter-order) is reversed, but the ordering within each
relative import level (intra-order) remains the same (i.e. normal lexical
order).

from . import c
from .baz import z
from .. import b
from ..bar import y
from ... import a
from ...foo import x

Signed-off-by: Peter Grayson pete@jpgrayson.net

[timothycrosley]

This is great,

Thank you!