SparseMatrix marked as Serializable

MathNet.Numerics.LinearAlgebra.Storage.MatrixStorage and
MathNet.Numerics.LinearAlgebra.Storage.SparseCompressedRowMatrixStorage
have been marked as Serializable

Update by ruegg: mark all other storage classes as Serializable as well,
get rid of tabs

src/Numerics/LinearAlgebra/Storage/DenseColumnMajorMatrixStorage.cs

@@ -3,6 +3,7 @@ using MathNet.Numerics.Properties;
 
 namespace MathNet.Numerics.LinearAlgebra.Storage
 {
+    [Serializable]
     public class DenseColumnMajorMatrixStorage<T> : MatrixStorage<T>
         where T : struct, IEquatable<T>, IFormattable
     {

src/Numerics/LinearAlgebra/Storage/DenseVectorStorage.cs

@@ -3,6 +3,7 @@ using MathNet.Numerics.Properties;
 
 namespace MathNet.Numerics.LinearAlgebra.Storage
 {
+    [Serializable]
     public class DenseVectorStorage<T> : VectorStorage<T>
         where T : struct, IEquatable<T>, IFormattable
     {

src/Numerics/LinearAlgebra/Storage/DiagonalMatrixStorage.cs

@@ -4,6 +4,7 @@ using MathNet.Numerics.Properties;
 
 namespace MathNet.Numerics.LinearAlgebra.Storage
 {
+    [Serializable]
     public class DiagonalMatrixStorage<T> : MatrixStorage<T>
         where T : struct, IEquatable<T>, IFormattable
     {

src/Numerics/LinearAlgebra/Storage/MatrixStorage.cs

@@ -3,6 +3,7 @@ using MathNet.Numerics.Properties;
 
 namespace MathNet.Numerics.LinearAlgebra.Storage
 {
+    [Serializable]
     public abstract partial class MatrixStorage<T> : IEquatable<MatrixStorage<T>>
         where T : struct, IEquatable<T>, IFormattable
     {

src/Numerics/LinearAlgebra/Storage/SparseCompressedRowMatrixStorage.cs

@@ -4,6 +4,7 @@ using MathNet.Numerics.Properties;
 
 namespace MathNet.Numerics.LinearAlgebra.Storage
 {
+    [Serializable]
     public class SparseCompressedRowMatrixStorage<T> : MatrixStorage<T>
         where T : struct, IEquatable<T>, IFormattable
     {

src/Numerics/LinearAlgebra/Storage/VectorStorage.cs

@@ -3,6 +3,7 @@ using MathNet.Numerics.Properties;
 
 namespace MathNet.Numerics.LinearAlgebra.Storage
 {
+    [Serializable]
     public abstract partial class VectorStorage<T> : IEquatable<VectorStorage<T>>
         where T : struct, IEquatable<T>, IFormattable
     {