Dual quaternion transformation estimation algorithm added
dq renamed to dual_quaternion;
tests added
dual quaternion precision changed to double to pass the tests
whitespaces added to comply with PCL style; small typos fixed
Partially fixes issue #124
more whitespaces added
Polydata object was only being allocated but the content was not copied.
Thus passing an empty object to renderViewTesselatedSphere.
Merge pull request #255 from arbeitor/master

Polydata object was only being allocated but the content was not copied.
Merge pull request #252 from jpapon/vtk_pointer_fix

Partially fixes issue #124
Merge pull request #169 from szagoruyko/dualquaternion

Dual quaternion transformation estimation feature