Update README.md
Merge remote-tracking branch 'upstream/master'
Merge pull request #8 from selvaggi/master

Added external fast jet examples.
update CHANGELOG for 3.2.0
update root tree description scripts
remove unneeded files from doc
improve formatting and remove trailing spaces
update config file directory and improve formatting
add cards to tar file and sort file names in Makefile
prepend GPLv3 header
fix GPLv3 header
fix bottom padding
remove unneeded elements from logo
remove unneeded elements from delphes logo
update delphes_logo.pdf
make include paths compatible with old and new pythia versions
Update README.md
set version to 3.2.0
adapt DelphesPythia8 to Pythia 8.2
move ExternalFastJet examples to examples/ExternalFastJet