ExaVector and ExaMatrix

[amontoison]

Modifications of @michel2323

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diff --git a/src/nlp.jl b/src/nlp.jl
index 5ab22f9..289e42a 100644
--- a/src/nlp.jl
+++ b/src/nlp.jl
@@ -100,13 +100,13 @@ Parameter
 )
 const Indexable = Union{Variable, Parameter, Subexpr, ParameterSubexpr}
 
-struct ExaVector{V<:Indexable} <: AbstractVector{AbstractNode}
+struct ExaVector{V <: Indexable} <: AbstractVector{AbstractNode}
     var::V
 end
 Base.size(v::ExaVector) = (v.var.length,)
 Base.getindex(v::ExaVector, i::Int) = v.var[i]
 
-struct ExaMatrix{V<:Indexable} <: AbstractMatrix{AbstractNode}
+struct ExaMatrix{V <: Indexable} <: AbstractMatrix{AbstractNode}
     var::V
 end
 Base.size(M::ExaMatrix) = M.var.size