CloudFare -> CloudFlare

Just saw some minor typos....
Merge pull request #1 from ataylor284/patch-1

CloudFare -> CloudFlare
Merge branch 'master' into gh-pages
pandoc -t html -s -S -c styles.css -T 'Virtual Currency Application Security' --section-divs -B header.html --toc --toc-depth=2 -N -A footer.html Virtual_Currency_Security.md -o index.html