[NSE] Added http-errors.nse that crawls through the website and returns any HTTP error pages.
[NSE] Added http-feed.nse that crawls through the website and returns any rss or atom feeds.
[NSE] Added a new library, formulas.lua, that holds some formula functions.
[NSE] cccam-version.nse makes use of the new 'formulas' library.
[NSE] Added http-csrf.nse that detects Cross Site Request Forgeries (CSRF) vulnerabilities in HTML forms.