Required packages declare in setup.py and Pipfile - dangerous redundancy

[vlcinsky]

Packages required by maya are now declared in setup.py but also in Pipfile (Pipfile.lock which gets generated on the way is out of scope).

tox tests are often great mean to detect broken requirements (such as omitted package). However, current status can easily hide such problem as a package omitted in setup.py may be installed via Pipfile declaration.

I think, proper solution is:

• remove all non-dev requirements from Pipfile and keep there only editable requirement for current package.
• maintain package requirements only within setup.py