v0.17.0

StartUpDG v0.17.0

Diff since v0.16.5

Closed issues:

• Unify gmsh import functionallity (#29)
• Add "periodic" to Base.show statement for MeshData (#128)
• Hex RefElemData assumes Kronecker/tensor product structure (#131)

Merged pull requests:

• Add pyramid RefElemData (#132) (@jlchan)
• Unify Gmsh accessors (#133) (@jlchan)
• Add docs on difference between StartUpDG.jl and NDG Matlab codes (#134) (@jlchan)
• Make Base.show more compact (#135) (@jlchan)
• specialize Polynomial{<:TensorProductQuadrature} Hex constructor (#136) (@jlchan)
• Add uniform pyramid mesh (#137) (@jlchan)
• remove deprecated approximationType getproperty (#139) (@jlchan)