Rate limiting needed in import_trakt.py for cleaning lists (-C option)

[alcoolfire]

Bug report #36 identified the need to rate limit list importing and this was fixed by @andrewchenk in #39 by adding a 1-second sleep to api_add_to_list() in import_trakt.py. The same problem exists for cleaning lists (-C option) and is fixed by adding the same sleep to api_remove_from_list().

I've attached the patch I used to repair this for myself. There is a bonus fix in this patch for an infinite loop bug that occurs if the -C option is used when the target list is already empty.

cleaning-lists.patch

[xbgmsharp]

hello,
Awesome can you make it a Pull request so the merge is track a proper way. thanks

[xbgmsharp]

Done via #66