Initial attempt at fixing futurize -d
Remove -d options from futurize and pasteurize for now

- lib2to3 makes some assumptions in the following line:

    assert clipped == [u"\n"] * (lineno-1), clipped

that would seem to preclude extra __future__ or future.builtins imports.
See issue #103.
Merge branch 'issue_103' into v0.13.x