Add method for showing base info about gensim

[menshikh-iv]

Intro

When users report something, we need to know more information (not only gensim version, versions of related packages, OS and so on), and user need to copy-paste&run something like this

Please run the following snippet and paste the output below.
import platform; print(platform.platform())
import sys; print("Python", sys.version)
import numpy; print("NumPy", numpy.__version__)
import scipy; print("SciPy", scipy.__version__)
import gensim; print("gensim", gensim.__version__)
from gensim.models import word2vec;print("FAST_VERSION", word2vec.FAST_VERSION)

We can easily add it as method to gensim and use as python -m gensim.scripts.package_info --info

Todo

Implement this method, information, that should be showed

• gensim version
• python version
• numpy version
• scipy version
• os version
• smart_open version
• FAST_VERSION variable
• path (where gensim installed)
• ??? (maybe something else)

[sharanry]

I am taking this up.