Fixed ImageToItkTest
Fixed ImageToItkTest

 * casting with correct types
 * testing for exception with wrong types
 * expplicit dereferencing of temporary itk image, test for expected exception

fmilano/mitk,rfloca/MITK,danielknorr/MITK,MITK/MITK,RabadanLab/MITKats,rfloca/MITK,iwegner/MITK,danielknorr/MITK,iwegner/MITK,lsanzdiaz/MITK-BiiG,fmilano/mitk,lsanzdiaz/MITK-BiiG,RabadanLab/MITKats,fmilano/mitk,iwegner/MITK,fmilano/mitk,iwegner/MITK,NifTK/MITK,danielknorr/MITK,iwegner/MITK,RabadanLab/MITKats,MITK/MITK,lsanzdiaz/MITK-BiiG,MITK/MITK,rfloca/MITK,NifTK/MITK,NifTK/MITK,danielknorr/MITK,fmilano/mitk,RabadanLab/MITKats,iwegner/MITK,fmilano/mitk,rfloca/MITK,MITK/MITK,RabadanLab/MITKats,lsanzdiaz/MITK-BiiG,lsanzdiaz/MITK-BiiG,rfloca/MITK,lsanzdiaz/MITK-BiiG,lsanzdiaz/MITK-BiiG,fmilano/mitk,NifTK/MITK,NifTK/MITK,rfloca/MITK,RabadanLab/MITKats,danielknorr/MITK,MITK/MITK,danielknorr/MITK,MITK/MITK,lsanzdiaz/MITK-BiiG,NifTK/MITK,rfloca/MITK,danielknorr/MITK