added json and csv export

[mmaelicke]

finally closes #37

todos for merge

• [x] place a test to increase coverage
• [x] re-run the docs of the find-cli (as flags were added)

[codecov[bot]]

Codecov Report

Merging #101 into master will increase coverage by 7.88%. The diff coverage is 42.62%.

@@            Coverage Diff             @@
##           master     #101      +/-   ##
==========================================
+ Coverage   49.44%   57.32%   +7.88%     
==========================================
  Files          52       54       +2     
  Lines        2259     2320      +61     
==========================================
+ Hits         1117     1330     +213     
+ Misses       1142      990     -152     

Flag	Coverage Δ
#e2e	57.32% <42.62%> (+7.88%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
metacatalog/cmd/_util.py	75.00% <ø> (+75.00%)	:arrow_up:
metacatalog/models/entry.py	71.68% <ø> (+7.96%)	:arrow_up:
metacatalog/cmd/find.py	52.00% <38.88%> (+52.00%)	:arrow_up:
metacatalog/util/dict_functions.py	40.00% <40.00%> (ø)
metacatalog/command_line.py	96.61% <100.00%> (+96.61%)	:arrow_up:
metacatalog/metacatalog	100.00% <0.00%> (ø)
metacatalog/api/db.py	81.00% <0.00%> (+2.00%)	:arrow_up:
metacatalog/models/person.py	68.42% <0.00%> (+10.52%)	:arrow_up:
... and 15 more

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