to solve the compiling error of fastjet
remove withnegweights 1
add example powheg cards, remove withnegweights requirement in the input card, rename the tarball name so to match the scheme in run_generic_tarball.sh
remove the command to retrieve runcmsgrid_powheg.sh from GIT
Merge pull request #117 from syuvivida/master

Include powheg input cards, minor changes in the create_powheg_tarball.sh and runcmsgrid_powheg.sh