Merge branch 'verticalEAS' into 'master'

Documentation/Examples/CMakeLists.txt

Documentation/Examples/boundary_example.cc

Documentation/Examples/cascade_example.cc

Documentation/Examples/stopping_power.cc

Documentation/Examples/vertical_EAS.cc

Environment/BaseExponential.h

Environment/IMediumModel.h

Environment/NuclearComposition.h

Framework/Cascade/Cascade.h

Framework/Geometry/Plane.h

Framework/ProcessSequence/ProcessSequence.h

Framework/Utilities/sgn.h

Processes/EnergyLoss/EnergyLoss.cc

Processes/EnergyLoss/EnergyLoss.h

Processes/ParticleCut/CMakeLists.txt

Processes/ParticleCut/ParticleCut.cc

Processes/ParticleCut/testParticleCut.cc

Processes/Pythia/Decay.cc

Processes/Pythia/Interaction.cc

Processes/UrQMD/urqmd.f