Add support for building various interfaces on Travis
Currently it only works for python_modular
fixed doxygen error in Statistics.h
Merge pull request #979 from lambday/develop

fixed doxygen error in Statistics.h
No filtered branches in travis.yml
inspired by Fernando
updated data with new GPR test example due to implementation change
Merge pull request #980 from karlnapf/develop

updated data with new GPR test example due to implementation change