old_contents: var gulp = require('gulp');
  var tslint = require('ionic-gulp-tslint');
  
  gulp.task('test', tslint);
  
new_contents: var gulp = require('gulp');
  var tslint = require('ionic-gulp-tslint');
  
  gulp.task('test', tslint);
  
  gulp.task('test', function() {
    return tslint({
      tslintOptions: {
        configuration: 'config/tslint.json'
      },
      reporter: "prose"
    });
  });
  
subject: Fix test error config file. Close #20