[MRG] Estimate Gaussian rotation

[AlexanderFabisch]

Fix #277

[codecov-commenter]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (dbdbe5b) 100.00% compared to head (26dfc2c) 99.84%.

Files	Patch %	Lines
pytransform3d/rotations/_random.py	42.85%	4 Missing :warning:

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #282      +/-   ##
===========================================
- Coverage   100.00%   99.84%   -0.16%     
===========================================
  Files           32       32              
  Lines         2555     2561       +6     
  Branches       294      294              
===========================================
+ Hits          2555     2557       +2     
- Misses           0        4       +4     

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