Clean up nodal reffe

[fverdugo]

No description provided.

[fverdugo]

Addresses issue #314

[codecov-commenter]

Codecov Report

Merging #319 into master will decrease coverage by 0.05%.
The diff coverage is 95.49%.

@@            Coverage Diff             @@
##           master     #319      +/-   ##
==========================================
- Coverage   88.42%   88.37%   -0.06%     
==========================================
  Files         152      152              
  Lines       10342    10303      -39     
==========================================
- Hits         9145     9105      -40     
- Misses       1197     1198       +1     

Impacted Files	Coverage Δ
src/Geometry/UnstructuredGrids.jl	69.29% <ø> (ø)
src/ReferenceFEs/ReferenceFEs.jl	100.00% <ø> (ø)
src/Visualization/Vtk.jl	93.00% <ø> (ø)
src/ReferenceFEs/LagrangianRefFEs.jl	94.24% <93.75%> (-1.87%)	⬇️
src/ReferenceFEs/CLagrangianRefFEs.jl	95.68% <95.68%> (ø)
src/Geometry/Triangulations.jl	79.74% <100.00%> (ø)
src/ReferenceFEs/CDLagrangianRefFEs.jl	91.54% <100.00%> (-7.00%)	⬇️
src/ReferenceFEs/NedelecRefFEs.jl	100.00% <100.00%> (ø)
src/ReferenceFEs/PDiscRefFEs.jl	100.00% <100.00%> (ø)
src/ReferenceFEs/RaviartThomasRefFEs.jl	98.52% <100.00%> (ø)
... and 6 more

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