updated installsize in nsis config
added code signing with Authenticode support Windows release script (fixes #72)
fixed NSIS version and URL
Authenticode signs uninstall.exe too (#72)
the uninstall.exe sig description is "Uninstall Onionshare" (#72)
fixed OSX filename-related issues
added one more 0.6 feature to changelog
version bump to 0.7dev