Adding login forwarding via config

[jcutler]

This is a second attempt at https://github.com/RJ/irccat/pull/11

Added code to send "login" (the users ident) to the command handler. We needed this to be able to compare the user's ident on a private IRC server.

This can be enabled by including this in the config xml:

<fields>
    <includelogin>true</includelogin>
</fields>

Without this setting in the config, it should be backwards compatible.

[jcutler]

This is not the most sustainable implementation, though. A spec outlining what extra fields are might be useful, I just don't know what else comes from Pircbot. I could look.

[avleen]

hey @RJ ! What do you think about merging this patch? :)