fix(logger): properly parse incoming syslog messages
fix(logger): remove priority from log messages

Our current log message follows this format:

    2014-09-02 09:40:00 deis[api]: message

Where `deis[api]` is the tag. Removing the priority keeps the
log message the same format as before.
test(logger): vendor in jeromer/syslogparser
Merge pull request #1757 from bacongobbler/syslog-parser

fix(logger): properly parse incoming syslog messages