Dev test envs

[vlfedotov]

Салют!
Вынес базовый settings в sites.
Оставил в dev/test только отличия от него.

Добавил nosetest и отчёты

Перенёс reqs(base, dev, test) в setup.py, а в самих файлах req[...].txt -- ссылки на setup

[codecov-io]

Codecov Report

Merging #11 into develop will decrease coverage by 5.25%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop      #11      +/-   ##
===========================================
- Coverage    95.07%   89.81%   -5.26%     
===========================================
  Files           34       35       +1     
  Lines         1623     1708      +85     
===========================================
- Hits          1543     1534       -9     
- Misses          80      174      +94

Impacted Files	Coverage Δ
business_logic/__init__.py	100% <ø> (ø)	⬆️
business_logic/blockly/exceptions.py	0% <0%> (-100%)	⬇️
business_logic/admin.py	96.55% <0%> (-3.45%)	⬇️
business_logic/rest/urls.py	100% <0%> (ø)	⬆️
business_logic/urls.py
sites/dev/books/migrations/__init__.py	0% <0%> (ø)
sites/dev/books/admin.py	3.44% <0%> (ø)

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