Skip logging timestamp in staging and production env

CustomFormatter skips logging timestamp in staging and production environments.

CustomFormatter uses Time.now instead of Time.now.utc

CustomFormatter uses Time.now instead of Time.now.utc to make CustomFormatter's log timestamps consistent with the default Rails logger timestamps.

Add custom rails logger formatter

See usage https://github.com/vendasta/yeti_logger/blob/master/README.md#custom-formatter

Added configuration to override debug logging for specific users

See usage at https://github.com/Yesware/yeti_logger/blob/master/README.md#override-debug-logging-level

First public release

Merge pull request #2 from Yesware/setup-travis-ci

Configure travis-ci.org