Initialize also projects when running under WSGI. Fixes #125

[osma]

No description provided.

[codecov]

Codecov Report

Merging #128 into master will increase coverage by 1.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #128      +/-   ##
==========================================
+ Coverage   97.22%   98.24%   +1.01%     
==========================================
  Files          34       34              
  Lines        1406     1421      +15     
==========================================
+ Hits         1367     1396      +29     
+ Misses         39       25      -14

Impacted Files	Coverage Δ
tests/test_project.py	100% <100%> (ø)	⬆️
annif/project.py	97.22% <100%> (+6.38%)	⬆️
annif/backend/backend.py	88.23% <0%> (-2.95%)	⬇️
annif/corpus/subject.py	100% <0%> (+18.42%)	⬆️

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[coveralls]

Coverage increased (+1.01%) to 97.896% when pulling eb68b29 on issue125-initialize-project into d56a8d1 on master.