Add gitignore
Use case-insensitive "invalid user" signature

This detects invalid user logins generated by OpenSSH on BSD.

Tracker:        http://sourceforge.net/p/sshguard/patches/7/
Submitted by:   François Charlier
Detect additional pre-auth disconnects
Update SSH "Bad protocol" signature

Some newer versions of OpenSSH append additional information to the bad
protocol warning, preventing the old signature from working.
Fix typo in startup error message
Update automatically generated files
Untrack automatically generated files
Update README and split COPYING