Added 3 new attributes to BasicCheck class
Removed old ruby version check. It's outdated and no longer needed
Add a method to return severity level. If it's provided by check
constructor then that value is used, otherwise is calculated using CVSS.
If no value and no CVSS are available the return value is "unknown".
The priority value is assigned as well. No magic here: it returns
"unknown" unless the priority value it has been specified.
Now severity, priority and family are included in vulnerabilities' list
Now severity, priority and check_family can passed as options during
class constrution
Added family and severity to Owasp RoR Cheatsheet files
Fixed a nil pointer error
Fixed "family" method
Removed '-f' short option for list-known-framework