title: extracting error information from rails log files
body: <p>i am developing on 5 different rails projects, plus also refactoring some (moving from older rails versions to 2.3) - what is the best way to extract the error information from the logfiles, so i can see all the depreciation warnings, runtime errors and so on, so i can work on improving the codebase?</p>
  
  <p>are there any services or libraries out there you can recommend, that actually help with rails logfile parsing?</p>