infra: split run/dev requirements, lock versions

[pkulev]

Closes issue(s): [ #73 ]

Description of the changes: Tornado API was changed. In dev-requirements.txt version constraint doesn't set, so all fails. But good news that pygame finally can be installer from PyPI, so I added it to requirements.

• What's new:
  • I splitted dev-requirements.txt to 2 files, for runtime and dev environment. make devel does both.
  • Container-base travis builds.
  • Multiple python versions runs tests via Makefile, beautiful.
• Fixes:
  • Lock tornado version in [4, 5).

Some tests can fail with uninitialized application, I will investigate this later. Python 2.7 will fail due to #75, this is ok for now.

[codecov-io]

Codecov Report

Merging #74 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #74   +/-   ##
=======================================
  Coverage   61.27%   61.27%           
=======================================
  Files          42       42           
  Lines        2381     2381           
=======================================
  Hits         1459     1459           
  Misses        922      922

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