Refer to binayFate instead of Fluffypony in guides to verify binaries
Note that i couldn't update the screenshots in the verification-windows-beginner.html guide, since i don't have a windows environment yet. So i added a note warning about the outdated screenshots. I will open an issue about adding new screenshots.
in verification-allos-advanced.html i updated the process adding @binaryFate's key and firgerprints, so a review of this PR from him would be appreciated.
Closes #1061 (closed)