WIP
WIP
WIP
WIP
WIP
WIP
WIP
Branch rebase and related changes
Renamed mask to array
Removed kernel test which required SciPy
Changed mask to array in kernel tests
Fixed docstring in CustomKernel
Again mask to array change
PEP8 and typo fixes
Fixed division error and removed boilerplate code
Added discretize function
Implemented simple kernel arithmetics and use of discretize_model
Added warnings for normalization and fixed tests
Added dicretize tests
Chnaged definition of box functions due to integrating issues