backend: Add logging configuration

[mariusmucenicu]

• Added files that end with the .log (*.log) extension to .gitignore
• Disabled logging in tests to keep the console clean
• LogRecords whose severity levels are up to and including WARNING are printed out to console.
• LogRecords whose severity levels are at least ERROR and upwards are stored to a file which grows to a maximum size of 500 MiB, then it gets rotated with another file which grows to the same size. When the second file reaches the limit, the first file is discarded and the second now takes its place while a new one is being logged to. So there will always be a rotation of 2 files of 500 MiB which will store ERROR and CRITICAL logs.

Resolves #157

[codecov[bot]]

Codecov Report

Merging #159 into master will decrease coverage by 0.19%. The diff coverage is 62.5%.

@@            Coverage Diff            @@
##           master     #159     +/-   ##
=========================================
- Coverage   76.14%   75.94%   -0.2%     
=========================================
  Files          10       11      +1     
  Lines        1224     1239     +15     
=========================================
+ Hits          932      941      +9     
- Misses        292      298      +6

Impacted Files	Coverage Δ
tests/test_lexicon.py	100% <ø> (ø)	:arrow_up:
tests/__init__.py	100% <100%> (ø)
knowlift/__init__.py	100% <100%> (ø)	:arrow_up:
knowlift/default_settings.py	66.66% <50%> (-33.34%)	:arrow_down:

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