use appdirs to determine default logging directory

[jklynch]

The default logging directory will be determined by appdirs.user_log_dir(). Environment variables BLUESKY_LOG_FILE and BLUESKY_IPYTHON_LOG_FILE can still be used to override the default.

This PR addresses issue #84.

[codecov-commenter]

Codecov Report

Merging #88 into master will increase coverage by 3.70%. The diff coverage is 96.51%.

@@            Coverage Diff             @@
##           master      #88      +/-   ##
==========================================
+ Coverage   53.11%   56.81%   +3.70%     
==========================================
  Files          13       13              
  Lines         819      880      +61     
==========================================
+ Hits          435      500      +65     
+ Misses        384      380       -4     

Impacted Files	Coverage Δ
nslsii/common/ipynb/logutils.py	92.85% <ø> (ø)
nslsii/__init__.py	28.72% <81.25%> (+3.72%)	:arrow_up:
nslsii/iocs/tests/test_epstwostate_ioc.py	100.00% <100.00%> (ø)
nslsii/tests/temperature_controllers_test.py	66.66% <100.00%> (ø)
nslsii/tests/test_logutils.py	100.00% <100.00%> (ø)

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[jklynch]

Why is test_Eurotherm failing?

[jklynch]

the only test failure is test_Eurotherm, still

[danielballan]

Pushed a commit to mark the problematic Eurotherm test that we are consistently ignoring as a "known failure" so that CI red/green is meaningful again.

[danielballan]

Because of the consistent Eurotherm failures we didn't notice flake8 errors. Added another commit fixing those....

[danielballan]

Green!