Update of python bindings + added example.

[stanislavsulc]

No description provided.

[codecov]

Codecov Report

Merging #73 into master will increase coverage by <.01%.
The diff coverage is 43.03%.

@@            Coverage Diff             @@
##           master      #73      +/-   ##
==========================================
+ Coverage   39.81%   39.82%   +<.01%     
==========================================
  Files        1241     1241              
  Lines      123876   123893      +17     
==========================================
+ Hits        49322    49335      +13     
- Misses      74554    74558       +4

Impacted Files	Coverage Δ
bindings/python/oofem.cpp	76.38% <43.03%> (+0.37%)	⬆️
src/oofemlib/fieldmanager.h	50% <0%> (-50%)	⬇️
src/oofemlib/timer.C	88% <0%> (-2.67%)	⬇️
src/oofemlib/uniformgridfield.h	0% <0%> (ø)	⬆️
src/oofemlib/engngm.h	16.66% <0%> (+1.17%)	⬆️

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