Add management commands logging support

[jrobichaud]

Closes #310

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (6dd72c4) 100.00% compared to head (44c504a) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #311   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           27        32    +5     
  Lines          365       404   +39     
=========================================
+ Hits           365       404   +39     

Files Changed	Coverage Δ
...go_structlog_demo_project/command_examples/apps.py	100.00% <100.00%> (ø)
...nd_examples/management/commands/example_command.py	100.00% <100.00%> (ø)
...ples/management/commands/example_nested_command.py	100.00% <100.00%> (ø)
...mo_project/command_examples/tests/test_commands.py	100.00% <100.00%> (ø)
django_structlog_demo_project/home/apps.py	100.00% <100.00%> (ø)

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