Missing conversion for GLNormalMesh(vertices, faces)

[rdeits]

In the Julia v0.5 version, I could do:

M = GLNormalMesh
V = vertextype(M)
F = facetype(M)
vs = [V(0., 0, 0), V(1., 0, 0), V(0., 1, 0)]
fs = [F(1, 2, 3)]
GLNormalMesh(vs, fs)

but in GeometryTypes master, that now throws:

MethodError: Cannot `convert` an object of type GeometryTypes.HomogenousMesh{GeometryTypes.Point{3,Float32},GeometryTypes.Face{3,GeometryTypes.OffsetInteger{1,UInt32}},Void,Void,Void,Void,Void} to an object of type GeometryTypes.HomogenousMesh{GeometryTypes.Point{3,Float32},GeometryTypes.Face{3,GeometryTypes.OffsetInteger{1,UInt32}},GeometryTypes.Normal{3,Float32},Void,Void,Void,Void}
This may have arisen from a call to the constructor GeometryTypes.HomogenousMesh{GeometryTypes.Point{3,Float32},GeometryTypes.Face{3,GeometryTypes.OffsetInteger{1,UInt32}},GeometryTypes.Normal{3,Float32},Void,Void,Void,Void}(...),
since type constructors fall back to convert methods.

Stacktrace:
 [1] GeometryTypes.HomogenousMesh{GeometryTypes.Point{3,Float32},GeometryTypes.Face{3,GeometryTypes.OffsetInteger{1,UInt32}},GeometryTypes.Normal{3,Float32},Void,Void,Void,Void}(::Array{GeometryTypes.Point{3,Float32},1}, ::Array{GeometryTypes.Face{3,GeometryTypes.OffsetInteger{1,UInt32}},1}) at /Users/rdeits/.julia/v0.6/GeometryTypes/src/meshes.jl:107