Added support for Loggly batch uploads
Replaced LogglyFormatter with option to change batch formatting in JsonFormatter
Added batch mode tests to JsonFormatter
Simplified formatBatchNewlines()
Revert "Simplified formatBatchNewlines()"

This reverts commit 4f91d1c58fe208d09ba4a8a14f75b0f02752e0d1.
Added 'timestamp' parameter to $record for indexing by Loggly
Merge pull request #309 from apancutt/master

Added support for Loggly batch uploads