Fixed "Invalid face reference: syslog-ip-face" error.
Removed defvar for syslog-ip-face which causes that error.
Multiple "Invalid face reference: t" fixed.

That message appeared in a *Messages* buffer (C-h e).

Faces are defined with `defface', not `defcustom', so they may be
customized and themed.
`syslog-font-lock-keywords' was modified appropriately.
Merge pull request #5 from alezost/master

"Invalid face reference" fixed