Added ball joint to urdf parser

[jfkunz]

No description provided.

[codecov-io]

Codecov Report

Merging #53 (9dfc31e) into master (34cfa35) will increase coverage by 1.37%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master      #53      +/-   ##
==========================================
+ Coverage   73.85%   75.23%   +1.37%     
==========================================
  Files          42       41       -1     
  Lines        3056     3004      -52     
==========================================
+ Hits         2257     2260       +3     
+ Misses        799      744      -55     

Impacted Files	Coverage Δ
src/ConstrainedDynamics.jl	100.00% <ø> (ø)
src/joints/joint.jl	45.16% <0.00%> (-6.70%)	⬇️
src/main_components/equalityconstraint.jl	75.96% <33.33%> (-3.07%)	⬇️
src/ui/urdf.jl	59.27% <33.33%> (+0.01%)	⬆️
src/optional_components/shapes.jl	79.54% <100.00%> (ø)
src/util/custom_static.jl	58.33% <0.00%> (-1.25%)	⬇️
src/discretization/linear/integrator.jl

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