bug fix:
- coverage : change default coverage file in coverage.ini (issue #185)
- ray : resolve problem when paramter value in horizontal and vertical
  plane are equal

Improvements
- localization.geometric : add __repr__ to geometric contraints and CLA
- simulnet : add __repr__ to simulnet
Merge pull request #186 from niamiot/master

bug fix (coverage ,signature.to3d)+ improvements (repr geometric + simulnet)