Add curve specific priors (see CubicHermiteSE3Curve)

[gawela]

To correctly fix a curve at a given time.
However, as in the HermiteCurve this introduces ExpressionFactors to curves. Do we want that?

[mikebosse]

it should be defined in the same way the evaluate expression is done

On Friday, February 27, 2015, gawela notifications@github.com wrote:

To correctly fix a curve at a given time.
However, as in the HermiteCurve this introduces ExpressionFactors to
curves. Do we want that?

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#52.