code: function(next) {
            if(!statDest || !lazy || readOnly) {
              return next();
            }
            if(statDest.mtime.getTime() >= statSrc.mtime.getTime()) {
              tally.useCached++;
              grunt.verbose.writeln('  Ignore %s:'+' Destination file is allready transformed (See options.lazy).'.grey, src.blue);
              // Leave proceed
              return done(null, false);
            } else {
              next();
            }
          }
docs: Ignore file processing if the destination allready exist with an equal or posterior mtime