fix: using --directory to set protoc output path (Issue #177)

[markdoerr]

Here is a suggestion to fix the protoc _pb2 generation output path, using the --directory option.

This would solve #177 .

[legau]

Hi,
I think you should also be able to define a different proto_path from the out options, with settings.BASE_DIR as default. As such the condition on https://github.com/socotecio/django-socio-grpc/pull/178/files#diff-54c9b4a9cdedf22408f568da5e1496b387cf7eb2841a7bd0671b8db8e2834ac9R117-R118 would be affected.
Thanks for your contribution

[markdoerr]

Thanks, @legau, for your comment,
I agree - if I understood your comment correctly - and make a suggestion to solve it.

[markdoerr]

@legau ,
I added the proto_path option.
Still need to test everything.

[AMontagu]

Hello @markdoerr

Can we close this PR ?

[markdoerr]

@AMontagu,
yes, I think, we can close it until we managed to finialise the examples ... sorry for all the delays :(