Fixed testing examples

[david-zwicker]

Fixed some types and documentation

[codecov]

Codecov Report

Patch coverage: 77.77% and project coverage change: +0.08 🎉

Comparison is base (b31070b) 89.85% compared to head (60d5412) 89.93%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #27      +/-   ##
==========================================
+ Coverage   89.85%   89.93%   +0.08%     
==========================================
  Files           8        8              
  Lines        1646     1650       +4     
==========================================
+ Hits         1479     1484       +5     
+ Misses        167      166       -1     

Flag	Coverage Δ
unittests	89.93% <77.77%> (+0.08%)	⬆️

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

Impacted Files	Coverage Δ
droplets/emulsions.py	88.76% <77.77%> (+0.13%)	⬆️

... and 1 file with indirect coverage changes

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