Json serialization of discrete models

[fverdugo]

No description provided.

[codecov-io]

Codecov Report

Merging #76 into master will increase coverage by 0.32%.
The diff coverage is 98.54%.

@@            Coverage Diff             @@
##           master      #76      +/-   ##
==========================================
+ Coverage   90.13%   90.45%   +0.32%     
==========================================
  Files          79       79              
  Lines        3739     3875     +136     
==========================================
+ Hits         3370     3505     +135     
- Misses        369      370       +1

Impacted Files	Coverage Δ
src/FESpaces/CLagrangianFESpaces.jl	96.48% <ø> (+0.48%)	⬆️
src/Geometry/GeometryWrappers.jl	97.6% <100%> (+0.16%)	⬆️
src/Gridap.jl	100% <100%> (ø)	⬆️
src/Geometry/DiscreteModels.jl	95.8% <98.43%> (+8.62%)	⬆️

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