setup.py clean should call cargo clean

[botev]

I think this makes sense. I'm not too sure if it is easy to do though as I'm not too familiar with python packaging.

Also on a side note, is there anyway to pass to setup.py the list of features we want to build and install with cargo?

[novocaine]

+1 for clean yes let's see what we can do. we just need a new cmd class overriding the existing clean cmd class, then users can mount that as clean or rust_clean if they don't like overriding the default

on CLI flags passed through - yes should be fine, we just need to come up with a convention for it and maybe you can file a separate issue with an example

see https://github.com/novocaine/rust-python-ext/blob/master/rust_ext/__init__.py#L22 for how --inplace is accepted (this is picked up the distutils superclass and set on self.inplace auto-magically)