Added generatesnippet.py from http://hg.mozilla.org/mozilla-central/file/f77bad5734a3/tools/update-packaging/generatesnippet.py
Added generatesnippet.py from http://hg.mozilla.org/mozilla-central/file/f77bad5734a3/tools/update-packaging/generatesnippet.py

neam/webapp-xul-wrapper,bala17/webapp-xul-wrapper,neam/webapp-xul-wrapper,bala17/webapp-xul-wrapper,bala17/webapp-xul-wrapper,bala17/webapp-xul-wrapper,neam/webapp-xul-wrapper,neam/webapp-xul-wrapper,bala17/webapp-xul-wrapper,neam/webapp-xul-wrapper,neam/webapp-xul-wrapper,bala17/webapp-xul-wrapper,bala17/webapp-xul-wrapper,bala17/webapp-xul-wrapper