add cmdline support for log_dir
Merge pull request #37 from rtoma/master

added support for cmdline option log_dir
Fixing version number on latest logster, source for JsonLogster had changed.

Change-Id: If387f1da3ffc3ffe0f165018eb9f08ec907ecde6
Fixing JsonLogster bug when keys contain '/'

Change-Id: I2acdbd86584ce4b5edb085ad97106bfd9a7f8701
Merge branch 'master' of https://github.com/etsy/logster
Updating changelog for changes from master

Change-Id: I3a711df0afaa1e5bfc42442a7f497658254f4d41
Merge branch 'master' into debian

Change-Id: I2a8d20d6fa27e0b34c5dc8213b70aa562e0e7344