Fix propagation of previously set default value for CUDA_ARCHITECTURE.
Fix compilation in case MDBQ is not found.
Merge pull request #2 from NikolausDemmel/cmake-fix

Fix propagation of previously set default value for CUDA_ARCHITECTURE.
update submodule 'ndarray'
README: add link to the master thesis
remove NO_DEFAULT_PATH in FindMDBQ.cmake. Closes #1
documentation