Defect: Logger level API usage and a misspelled filename.

[chunpan]

A small fix to address two defects:

1. A misspelled filename.
2. Correct the following usage: Rails.logger.level == Logger::DEBUG --> Rails.logger.debug? (The original code would only work with the default Logger class. It wouldn't have worked with a different logger such as SemanticLogger.)

cc: @hokaccha

[chunpan]

It's been 10 months, without a single reviewer/approver/feedback. Is this a dead project?