Added level functions to syslog: debug, info, notice, warning, error, critical, alert, and emergency. Added also an usage test as simple and direct as possible, in the way of a escript. And adde also .DS_Store to .gitignore (a little bit dispensable, I know).
Updated README
accept timestamp as opt in erlang_syslog:send/3
use Z instead of +00:00 for timezone offset
proper syslog format

RFC5424 has split the TAG field into APP-NAME, PROCID, and MSGID. The
app_name option is now required at init, but can be overridden on a
per-message basis.
readme fixup
add hostname option