Core cmake build infrastructure from NeuroDebian (only CMakeLists files)

build out-of-source with e.g.
mkdir -p build; cd build; cmake -DBUILD_SHARED_LIBS:BOOL=ON ..; PATH=/usr/lib/ccache:$PATH make
Basic travis setup
Merge pull request #3 from yarikoptic/enh/cmakification

Enh/cmakification