registry for scaleAdd/FV/V
dot product of FV with V
made operators serializable
DenseMatrix * SparseVector, odd oversight
fixes #289
Merge remote-tracking branch 'upstream/master' into develop

* upstream/master:
  fixes #289
  DenseMatrix * SparseVector, odd oversight
  made operators serializable
  dot product of FV with V
  registry for scaleAdd/FV/V
Merge branch 'develop' into feature/algebra

* develop:
  fixes #289
  DenseMatrix * SparseVector, odd oversight
  made operators serializable
  dot product of FV with V
  registry for scaleAdd/FV/V