Only open log files once
Only write once for each log line
SIGHUP to reopen log files
Custom log delimiter

Added option (-d) to specify a custom delimiter between the fields
in the log files.
Merge remote-tracking branch 'upstream/master'
Added JSON output option

Logging could be structured as JSON if passivedns is started with -j/-J.

To enable this feature, --enable-json must be passed to configure.
Merge pull request #38 from thus/master

Changes done to logging (JSON, custom delimiter, +++)