logdiff now support bzipped logs for logdiff

Dependencies

• [2] TH674WKJ add log diff to compare logs to previous builds
• [3] BKOIYITR added some json responses

Change contents

• replacement in src/lib/Hydra/Controller/API.pm at line 236
  [2.198]→[2.198:230](∅→∅)
  − my $res = read_file($file);
  [2.198]

  [3.6138]
  + my $pipe = (-f "$file.bz2" ? "cat $file | bzip2 -d" : "cat $file") ;

  + my $pipe = (-f "$file.bz2" ? "cat $file.bz2 | bzip2 -d" : "cat $file") ;

  + my $res = `$pipe`;