Separate unit test config from real config. Fixes #76

[osma]

No description provided.

[codecov]

Codecov Report

Merging #77 into master will decrease coverage by 0.25%.
The diff coverage is 96.58%.

@@            Coverage Diff             @@
##           master      #77      +/-   ##
==========================================
- Coverage   96.54%   96.29%   -0.26%     
==========================================
  Files          27       28       +1     
  Lines        1043     1079      +36     
==========================================
+ Hits         1007     1039      +32     
- Misses         36       40       +4

Impacted Files	Coverage Δ
annif/backend/backend.py	88% <100%> (-0.89%)	⬇️
tests/conftest.py	100% <100%> (ø)
tests/test_project.py	100% <100%> (ø)	⬆️
tests/test_backend_tfidf.py	100% <100%> (ø)	⬆️
tests/test_backend_http.py	100% <100%> (ø)	⬆️
annif/project.py	100% <100%> (ø)	⬆️
annif/__init__.py	100% <100%> (ø)	⬆️
tests/test_cli.py	100% <100%> (ø)	⬆️
config.py	100% <100%> (ø)	⬆️
tests/test_backend.py	100% <100%> (ø)	⬆️
... and 3 more

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[coveralls]

Coverage decreased (-0.4%) to 96.197% when pulling 142cb0a on separate-config into 2a34705 on master.

[coveralls]

Coverage decreased (-0.3%) to 96.293% when pulling 13ad85f on separate-config into 2a34705 on master.