Add tor-gencert.exe to tor expert bundle
At the recent tor developer meeting, a volunteer tried to get chutney working on Windows, but tor-gencert.exe wasn't in the tor expert bundle.
If we want people to test Tor on Windows, we need to add at least tor-gencert.exe to the windows expert ~~~and nightly~~~ bundles. ~~~There might be other binaries we want to add as well.~~~