Add example input cards for the new processes in POWHEG BOX V2

The following processes are now added in the CMSSW powheg source tar ball:

1) W
2) Z
3) Z2jet
4) gg_H_2HDM
5) gg_H_MSSM
6) gg_H_quark-mass-effects

Add example input cards and input files that are required for these processes.