Works with (sigma2 * Id) set in the method as point covariance.
Tests now work for PosteriorModelBuilder using sigma2I as a covariance
matrix, set in a dedicated C++ method.
Now has a C++ test that sets a uniform matrix from the outside.
Removed the bug that the covariance and precision matrix were confused.
The C++ test now has a simple test with a one-point model, but
non-uniform point covariance matrix. Seems to be working.
Posterior model builder now has a test that acutally tests the 3D
posterior with an anisotropic noise model for one point.
Added ITK posterior model builder.
Changed test posterior model builder C++ test to use eigen functionality
rather than VTK for finding tangential vectors.
In recent version of ITK, template parameters for PointsLocator have changed

Since 2ea5b37391ca21f2c1e295e803da2740d6ea6980 PointsLocator templater
parameters have been simplified
fix issue #26
remove using namespace H% when not needed in StatisticalModel.txx
Made template parameters of itkPointsLocator depend on ITK version
One typo, one additional function wrapped.
Merge remote-tracking branch 'upstream/master' into PartiallyFixedGeneralCovariance

Conflicts:
	statismo/PosteriorModelBuilder.h
	statismo/PosteriorModelBuilder.txx
	statismo_ITK/itkPosteriorModelBuilder.h
removed duplicated definition of PosteriorModelBuilder
Added documentation.
Merge branch 'PartiallyFixedGeneralCovariance' of https://github.com/tom-albrecht/statismo into tom-albrecht-PartiallyFixedGeneralCovariance
support for vtk 6.0
removed explicit list of vtk libraries
Merge branch 'vtk-6-support' of https://github.com/marcelluethi/statismo into marcelluethi-vtk-6-support

Conflicts:
	CMakeLists.txt
fixed double inclusion of representer tests