ENH: heavier debugging -- log split date/log line even for no match.  Log matching regex upon match
ENH: anchor roundcube-auth at the beginning as well
ENH: <HOST> must end with alphanumeric \w (not a dot or a dash etc)

Otherwise <HOST> regexp might swallow period in the sentence right after the address.
I have decided to enforce alphanumeric instead of switching to non-greedy +? ... because
I think it is closer to what we actually want here
ENH: roundcube-auth - adopt for current format with trailing error message.  thanks @kwirk for the review/feedback

I also used non-greedy .*? for the login portion since not sure if space could
be there and trying to minimize possibility of reacting on injected "from
<HOST>" somewhere within the trailing .*
DOC: changelog entries for preceeding changes
Merge pull request #283 from yarikoptic/master

Roundcube failregex -- anchor at the beginning as well + mandate <HOST> to end with alphanumeric