Kunihiko Miyoshi

Iterating the result of `Pandas.DataFrame.groupby` fails with `pandas>=1.1.0`. This failure seems to be caused by [`PrettyDict`](https://github.com/pandas-dev/pandas/blob/master/pandas/io/formats/printing.py#L544-L548) which is the alternative type of `dict` and added on `pandas==1.1.0`. The log shows...

This PR fixes the versions of dependencies for `Dockerfile`, because of [MKL-DNN](https://github.com/intel/mkl-dnn)'s destructive change planned on `v1.0.0`. In addition, I added `Dockerfile.pkg` which depends on prebuilt packages distributed on [Menoh's...

refine class names

1

The class name `Menoh::Menoh` is little bit redundant.

The gem package `rake-compiler` is needed only for multi environmental deployment. This library simply builds a native extension, so it can be independent from `rake-compiler`.