This patch includes the "offlineimap" string and the proccess id
in the output for non interactive logs and syslog logs.
Now, the output is something like this (syslog):
Oct 11 21:55:10 yangon offlineimap[635798]: Syncing foo: IMAP -> Maildir
Oct 11 21:55:10 yangon offlineimap[635798]: Syncing foo bar: IMAP -> Maildir
Oct 11 21:55:10 yangon offlineimap[635798]: Syncing INBOX: IMAP -> Maildir
Oct 11 21:55:10 yangon offlineimap[635798]: Syncing bar: IMAP -> Maildir
Oct 11 21:55:10 yangon offlineimap[635798]: Syncing Trash: IMAP -> Maildir
Closes#88