Merge remote-tracking branch 'mdroth/qga-pull-2013-7-25' into staging

# By Laszlo Ersek
# Via Michael Roth
* mdroth/qga-pull-2013-7-25:
  qga: escape cmdline args when registering win32 service (CVE-2013-2231)
  ga_install_service(): nest error paths more idiomatically
  qga/service-win32.c: diagnostic output should go to stderr

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