Path enhancements

[yuripourre]

Add helper methods:

• Get firstCurve
• Move
• Scale

[yuripourre]

Move:

    for (DataCurve curve : path.getCurves()) {
        move(curve.getStart(), x, y);
        move(curve.getEnd(), x, y);
        if (CurveType.QUADRATIC_BEZIER == curve.getType()) {
            QuadraticCurve c = (QuadraticCurve) curve;
            move(c.getControl1(), x, y);
        } else if (CurveType.CUBIC_BEZIER == curve.getType()) {
            CubicCurve c = (CubicCurve) curve;
            move(c.getControl1(), x, y);
            move(c.getControl2(), x, y);
        }
    }

Scale:
// Calculate centroid
// Move to centroid
// Scale
// Move back