add helpers aggregating settings from all libraries

[gdesmott]

Based on #30

Fix #28

[codecov]

Codecov Report

Merging #32 (b8dcdbc) into master (a727fbd) will increase coverage by 1.31%.
The diff coverage is 93.77%.

@@            Coverage Diff             @@
##           master      #32      +/-   ##
==========================================
+ Coverage   89.88%   91.20%   +1.31%     
==========================================
  Files           3        3              
  Lines        1552     1705     +153     
==========================================
+ Hits         1395     1555     +160     
+ Misses        157      150       -7     

Impacted Files	Coverage Δ
src/lib.rs	83.79% <89.38%> (+2.07%)	⬆️
src/metadata.rs	97.95% <100.00%> (+0.63%)	⬆️
src/test.rs	97.46% <100.00%> (+0.31%)	⬆️

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